HTML&CSS学习(一)
<h1><span style="font-size: 18px">前言</span></h1><p>为B站pink老师《<span class="tit">黑马程序员pink老师前端入门视频教程 HTML5+CSS3+移动端布局-flex布局rem布局响应式布局摹客蓝湖使用-简单有趣好玩》视频教程学习笔记。</span></p>
<p> </p>
<h1 id="gaishu"><span style="font-size: 18px">1.概述</span></h1>
<p>HTML,全称Hyper Text Markup Language,即超文本链接语言</p>
<h2><span style="font-size: 16px">1.1 开发工具</span></h2>
<p>测试使用vscode,官网下载安装即可,可以安装以下插件:</p>
<p>chinese</p>
<p>open in browser</p>
<p>auto rename tag</p>
<p>新建文件,保存为html格式,输入!,按下tab键,可以自动生成骨架代码:</p>
<div class="cnblogs_code">
<pre><span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)">文档声明标签,告诉浏览器使用HTML5版本显示网页</span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><!</span><span style="color: rgba(255, 0, 255, 1)">DOCTYPE html</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)">当前文档显示语言为中文</span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">html </span><span style="color: rgba(255, 0, 0, 1)">lang</span><span style="color: rgba(0, 0, 255, 1)">="zh-CN"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)">字符编码</span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">charset</span><span style="color: rgba(0, 0, 255, 1)">="UTF-8"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="viewport"</span><span style="color: rgba(255, 0, 0, 1)"> content</span><span style="color: rgba(0, 0, 255, 1)">="width=device-width, initial-scale=1.0"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>Document<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">html</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
</div>
<h2><span style="font-size: 18px">1.2 <span style="font-size: 16px">Emmet语法</span></span></h2>
<p>Emmet语法的前身是Zen coding,它使用缩写来提高html/css编写速度,Vscode内部已集成该语法。<br><strong>快速生成html结构</strong><br>1.标签名+tab,快速生成标签<br>2.div*10+tab,快速生成多个标签<br>3.ul>li,快速生成父子标签<br>4.div+p,快速生成兄弟标签<br>5. .nav+tab/#nav+tab p.one+tab 快速生成类/id<br>6. .demo$*5+tab 生成有自增符号的类<br>7. div{hello} div{hello}*5 div{$}*5</p>
<p><strong>快速生成CSS样式</strong><br>tdn...</p>
<h1><span style="font-size: 18px">2.案例</span></h1>
<p>摹写"学成在线"首页(p195-p220)</p>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200917051102578-139663098.jpg" alt="" loading="lazy"></p>
<p>index.html</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_7ba55d5e-47c2-4571-ad41-e79dbbc7b8cd" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_7ba55d5e-47c2-4571-ad41-e79dbbc7b8cd" class="code_img_opened" style="display: none">
<div id="cnblogs_code_open_7ba55d5e-47c2-4571-ad41-e79dbbc7b8cd" class="cnblogs_code_hide">
<pre><span style="color: rgba(0, 0, 255, 1)"><!</span><span style="color: rgba(255, 0, 255, 1)">DOCTYPE html</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">html </span><span style="color: rgba(255, 0, 0, 1)">lang</span><span style="color: rgba(0, 0, 255, 1)">="zh-CN"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">charset</span><span style="color: rgba(0, 0, 255, 1)">="UTF-8"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="viewport"</span><span style="color: rgba(255, 0, 0, 1)"> content</span><span style="color: rgba(0, 0, 255, 1)">="width=device-width, initial-scale=1.0"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>学成在线<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">link </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="style.css"</span><span style="color: rgba(255, 0, 0, 1)"> rel</span><span style="color: rgba(0, 0, 255, 1)">="stylesheet"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)"> header </span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="header w"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)"> logo </span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="logo"</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">img </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(255, 0, 0, 1)"> alt</span><span style="color: rgba(0, 0, 255, 1)">="logo"</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)"> nav </span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="nav"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">ul</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>首页<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>课程<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>职业规划<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">ul</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)"> search </span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="search"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">input </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="input"</span><span style="color: rgba(255, 0, 0, 1)"> type</span><span style="color: rgba(0, 0, 255, 1)">="text"</span><span style="color: rgba(255, 0, 0, 1)"> value</span><span style="color: rgba(0, 0, 255, 1)">="输入关键词"</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">input </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="btn"</span><span style="color: rgba(255, 0, 0, 1)"> type</span><span style="color: rgba(0, 0, 255, 1)">="button"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)">user</span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="user"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">img </span><span style="color: rgba(255, 0, 0, 1)">src</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(255, 0, 0, 1)"> alt</span><span style="color: rgba(0, 0, 255, 1)">="avatar"</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">img</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></span>user-name<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)"> banner </span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="banner"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)"> subbanner </span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="subbanner w"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="subnav"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">ul</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>前端开发<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="color: rgba(255, 0, 0, 1)">&gt;</span><span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>后端开发<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="color: rgba(255, 0, 0, 1)">&gt;</span><span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>移动开发<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="color: rgba(255, 0, 0, 1)">&gt;</span><span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>人工智能<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="color: rgba(255, 0, 0, 1)">&gt;</span><span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>商业预测<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="color: rgba(255, 0, 0, 1)">&gt;</span><span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">span</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
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<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>Think PHP 5.0 博客系统实战项目演练<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>
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<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>Think PHP 5.0 博客系统实战项目演练<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>
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<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>Think PHP 5.0 博客系统实战项目演练<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>
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<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dt</span><span style="color: rgba(0, 0, 255, 1)">></span>新手指南<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dt</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>如何注册<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>如何选课<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>如何拿到毕业证<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>学分是什么<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>考试未通过怎么办<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dl</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dl</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dt</span><span style="color: rgba(0, 0, 255, 1)">></span>合作伙伴<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dt</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>合作机构<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">a </span><span style="color: rgba(255, 0, 0, 1)">href</span><span style="color: rgba(0, 0, 255, 1)">="#"</span><span style="color: rgba(0, 0, 255, 1)">></span>合作导师<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dl</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">html</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<pre><span style="color: rgba(128, 0, 0, 1)">* </span>{<span style="color: rgba(255, 0, 0, 1)">
margin</span>:<span style="color: rgba(0, 0, 255, 1)"> 0</span>;<span style="color: rgba(255, 0, 0, 1)">
padding</span>:<span style="color: rgba(0, 0, 255, 1)"> 0</span>;
}<span style="color: rgba(128, 0, 0, 1)">
body </span>{<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> #f3f5f7</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.w </span>{<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 1200px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 auto</span>;
}<span style="color: rgba(128, 0, 0, 1)">
a </span>{<span style="color: rgba(255, 0, 0, 1)">
text-decoration</span>:<span style="color: rgba(0, 0, 255, 1)"> none</span>;
}<span style="color: rgba(128, 0, 0, 1)">
li </span>{<span style="color: rgba(255, 0, 0, 1)">
list-style</span>:<span style="color: rgba(0, 0, 255, 1)"> none</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.clear</span>{<span style="color: rgba(255, 0, 0, 1)">
clear</span>:<span style="color: rgba(0, 0, 255, 1)"> both</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header </span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 44px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin</span>:<span style="color: rgba(0, 0, 255, 1)"> 30px auto</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .logo </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 200px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 44px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> blueviolet</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .nav </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-left</span>:<span style="color: rgba(0, 0, 255, 1)"> 25px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> burlywood</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .nav ul li</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
margin</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 15px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .nav ul li a</span>{<span style="color: rgba(255, 0, 0, 1)">
display</span>:<span style="color: rgba(0, 0, 255, 1)"> block</span>;<span style="color: rgba(255, 0, 0, 1)">
padding</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 10px</span>;<span style="color: rgba(255, 0, 0, 1)">
line-height</span>:<span style="color: rgba(0, 0, 255, 1)"> 44px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 18px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #050505</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .nav ul li a:hover </span>{<span style="color: rgba(255, 0, 0, 1)">
border-bottom</span>:<span style="color: rgba(0, 0, 255, 1)"> 2px solid #00a4ff</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .search</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 411px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 42px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin</span>:<span style="color: rgba(0, 0, 255, 1)"> 1px 0px 1px 70px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> chocolate</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .search .input</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 340px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 40px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 14px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #bfbfbf</span>;<span style="color: rgba(255, 0, 0, 1)">
padding-left</span>:<span style="color: rgba(0, 0, 255, 1)"> 20px</span>;<span style="color: rgba(255, 0, 0, 1)">
border</span>:<span style="color: rgba(0, 0, 255, 1)"> 1px solid #00a4ff</span>;<span style="color: rgba(255, 0, 0, 1)">
border-right</span>:<span style="color: rgba(0, 0, 255, 1)"> none</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .search .btn</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 50px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 42px</span>;<span style="color: rgba(255, 0, 0, 1)">
border</span>:<span style="color: rgba(0, 0, 255, 1)"> none</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> #00a4ff</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .user</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> right</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 44px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-right</span>:<span style="color: rgba(0, 0, 255, 1)"> 30px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> darkorange</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .user a</span>{<span style="color: rgba(255, 0, 0, 1)">
display</span>:<span style="color: rgba(0, 0, 255, 1)"> block</span>;<span style="color: rgba(255, 0, 0, 1)">
line-height</span>:<span style="color: rgba(0, 0, 255, 1)"> 44px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.header .user a img </span>{<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 33px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 33px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> grey</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner </span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 420px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> blue</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner </span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 420px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> silver</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .subnav</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 154px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> rgb(0,0,0,.3)</span>;<span style="color: rgba(255, 0, 0, 1)">
padding</span>:<span style="color: rgba(0, 0, 255, 1)"> 3px 20px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .subnav ul li</span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 46px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .subnav ul li a</span>{<span style="color: rgba(255, 0, 0, 1)">
line-height</span>:<span style="color: rgba(0, 0, 255, 1)"> 46px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 14px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> white</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .subnav ul li a:hover </span>{<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #00b4ff</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .subnav ul li a span</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> right</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .course </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> right</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 230px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 300px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 50px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> white</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .course h2</span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 50px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 18px</span>;<span style="color: rgba(255, 0, 0, 1)">
text-align</span>:<span style="color: rgba(0, 0, 255, 1)"> center</span>;<span style="color: rgba(255, 0, 0, 1)">
line-height</span>:<span style="color: rgba(0, 0, 255, 1)"> 50px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> white</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> #9bceea</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .course ul</span>{<span style="color: rgba(255, 0, 0, 1)">
padding</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 20px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .course ul li</span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 50px</span>;<span style="color: rgba(255, 0, 0, 1)">
border-bottom</span>:<span style="color: rgba(0, 0, 255, 1)"> 1px solid #eaeaea</span>;<span style="color: rgba(255, 0, 0, 1)">
padding-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 15px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .course ul li h4</span>{<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 16px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #4e4e4e</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .course ul li p</span>{<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 12px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #a5a5a5</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.banner .subbanner .course button</span>{<span style="color: rgba(255, 0, 0, 1)">
display</span>:<span style="color: rgba(0, 0, 255, 1)"> block</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 200px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 40px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #00a4ff</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 16px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 auto</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 5px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> white</span>;<span style="color: rgba(255, 0, 0, 1)">
border</span>:<span style="color: rgba(0, 0, 255, 1)"> 1px solid #00a4ff</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods</span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 60px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 8px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> white</span>;<span style="color: rgba(255, 0, 0, 1)">
box-shadow</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 2px 3px 3px rgba(0,0,0,0.1)</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods .goods-left </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
line-height</span>:<span style="color: rgba(0, 0, 255, 1)"> 60px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods .goods-left h3</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
padding</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 30px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 16px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #00a4ff</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods .goods-left ul</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods .goods-left ul li</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods .goods-left ul li a</span>{<span style="color: rgba(255, 0, 0, 1)">
padding</span>:<span style="color: rgba(0, 0, 255, 1)"> 0 30px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 16px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #050505</span>;<span style="color: rgba(255, 0, 0, 1)">
border-left</span>:<span style="color: rgba(0, 0, 255, 1)">1px solid #bfbfbf</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods .goods-mod </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> right</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 22px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-right</span>:<span style="color: rgba(0, 0, 255, 1)"> 38px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.goods .goods-mod a</span>{<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 14px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #00a4ff</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box </span>{<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 33px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-hd </span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 42px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-hd h2</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 20px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-weight</span>:<span style="color: rgba(0, 0, 255, 1)"> normal</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #494949</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-hd a </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> right</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 10px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-right</span>:<span style="color: rgba(0, 0, 255, 1)"> 33px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 12px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #a5a5a5</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-bd ul </span>{<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 1225px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-bd ul li</span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 230px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 270px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-right</span>:<span style="color: rgba(0, 0, 255, 1)"> 15px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-bottom</span>:<span style="color: rgba(0, 0, 255, 1)"> 15px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> white</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-bd ul li img</span>{<span style="color: rgba(255, 0, 0, 1)">
display</span>:<span style="color: rgba(0, 0, 255, 1)"> block</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 100%</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 156px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-bd ul li h4</span>{<span style="color: rgba(255, 0, 0, 1)">
padding-left</span>:<span style="color: rgba(0, 0, 255, 1)"> 20px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 14px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-weight</span>:<span style="color: rgba(0, 0, 255, 1)"> 400</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #050505</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-bd ul li p</span>{<span style="color: rgba(255, 0, 0, 1)">
padding-left</span>:<span style="color: rgba(0, 0, 255, 1)"> 20px</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 17px</span>;<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 12px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #999999</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box .box-bd ul li p span</span>{<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #ff7c2d</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer </span>{<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 417px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)">white</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .copyright </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .w </span>{<span style="color: rgba(255, 0, 0, 1)">
padding-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 33px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .copyright p </span>{<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 12px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #666666</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 24px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .copyright a</span>{<span style="color: rgba(255, 0, 0, 1)">
display</span>:<span style="color: rgba(0, 0, 255, 1)"> block</span>;<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 120px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 30px</span>;<span style="color: rgba(255, 0, 0, 1)">
text-align</span>:<span style="color: rgba(0, 0, 255, 1)"> center</span>;<span style="color: rgba(255, 0, 0, 1)">
line-height</span>:<span style="color: rgba(0, 0, 255, 1)"> 30px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #00a4ff</span>;<span style="color: rgba(255, 0, 0, 1)">
border</span>:<span style="color: rgba(0, 0, 255, 1)"> 1px solid #00a4ff</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-top</span>:<span style="color: rgba(0, 0, 255, 1)"> 15px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .links </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> right</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-right</span>:<span style="color: rgba(0, 0, 255, 1)"> 30px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .links dl </span>{<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-left</span>:<span style="color: rgba(0, 0, 255, 1)"> 110px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .links dt </span>{<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 16px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #333333</span>;<span style="color: rgba(255, 0, 0, 1)">
margin-bottom</span>:<span style="color: rgba(0, 0, 255, 1)"> 10px</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.footer .links dd a</span>{<span style="color: rgba(255, 0, 0, 1)">
font-size</span>:<span style="color: rgba(0, 0, 255, 1)"> 12px</span>;<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> #333333</span>;
}</pre>
</div>
<span class="cnblogs_code_collapse">View Code</span></div>
<p> </p>
<h1><span style="font-size: 18px">3.CSS</span></h1>
<h2><span style="font-size: 16px">3.1 概述</span></h2>
<p>全称Cascading Style Sheet,即层叠样式表,或CSS样式表</p>
<h3><span style="font-size: 15px"><strong>3.1.1 CSS规则</strong></span></h3>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200915044109788-1476705612.png" alt="" loading="lazy"></p>
<p> </p>
<h3><span style="font-size: 15px"><strong>3.1.2 CSS代码风格(建议规范写法)</strong></span></h3>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200915050139775-1283819454.png" alt="" loading="lazy"></p>
<p> </p>
<p> </p>
<h3><span style="font-size: 15px"><strong>3.1.3 引入CSS的方式</strong></span></h3>
<p>(1)行内样式表(行内式)<br><style></style>。控制当前html页面,理论上可以放在html的任何位置,一般放在<head></head>标签内</p>
<p>(2)内部样式表(嵌入式)<br><div style=""></div></p>
<p>(3)外部样式表(链接式)<br><link rel="stylesheet" href="css文件路径"></p>
<h3><span style="font-size: 15px"><strong>3.1.4 CSS选择器分类</strong></span></h3>
<p>(1)标签选择器,标签名 {}</p>
<p>(2)类选择器,.类名 {}</p>
<p>①CSS class 命名规范</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_4c0a66b1-0b9d-4e10-ad88-03c161a9f350" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_4c0a66b1-0b9d-4e10-ad88-03c161a9f350" class="code_img_opened" style="display: none">
<div id="cnblogs_code_open_4c0a66b1-0b9d-4e10-ad88-03c161a9f350" class="cnblogs_code_hide">
<pre>名称类
头:header
内容:content .container
尾:footer
导航:nav
侧栏:sidebar
栏目:column
页面外围布局:wrapper
左右中:left right center
登录条:loginbar
标志:logo
广告:banner
页面主体:main
热点:hot
新闻:news
下载:download
子导航:subnav
菜单:menu
子菜单:submenu
搜索:search
友情链接:friendlink
页脚:footer
版权:copyright
滚动:scroll
内容:content
标签页:tab
文章列表:list
提示信息:msg
小技巧:tips
栏目标题:title
加入:joinus
指南:guild
服务:service
注册:regsiter
状态:status
投票:vote
合作伙伴:partner
CSS 文件命名
主要 master.css
模块 module.css
公用 base.css
布局 layout.css
主题 themes.css
专栏 columns.css
文字 font.css
图标 icon.css
表单 forms.css
补丁 mend.css
打印 print.css
原子类
/* font-style */
.n{font-weight:normal; font-style:normal;}.b{font-weight:bold;}.i{font-style:italic;}
/* text-align */
.tc{text-align:center;}.tr{text-align:right;}.tl{text-align:left;}.tj{text-align:justify;}
/* text-decoration */
.tdl{text-decoration:underline;}.tdn,.tdn:hover,.tdn a:hover,a.tdl:hover{text-decoration:none;}
/* letter-spacing */
.lt-1{letter-spacing:-1px;}.lt0{letter-spacing:0;}.lt1{letter-spacing:1px;}
/* white-space */
.nowrap{white-space:nowrap;}
/* word-wrap */
.bk{word-wrap:break-word;}
/* vertical-align */
.vm{vertical-align:middle;}.vtb{vertical-align:text-bottom;}.vb{vertical-align:bottom;}.vt{vertical-align:top;}.vn{vertical-align:-2px;}
/* clear */
.cl{clear:both;}
/* position */
.rel{position:relative;}.abs{position:absolute;}
/*z-index*/
.zx1{z-index:1;}.zx2{z-index:2;}
/* cursor */
.poi{cursor:pointer;}.def{cursor:default;}
/* overflow */
.ovh{overflow:hidden;}.ova{overflow:auto;}
/* visibility */
.vh{visibility:hidden;}.vv{visibility:visible;}
/* zoom */
.z{*zoom:1;}
工具类
/*浮动*/
.fl{float:left;}.fr{float:right;}
/*清除浮动*/
.clearfix{
*zoom:1;
}
.clearfix:before,.clearfix:after {
display: table;
content: ”;
}
.clearfix:after {
clear: both;
overflow: hidden;
}
/*显示*/
.hide {
display: none !important;
}
.show {
display: block !important;
}
.invisible {
visibility: hidden;
}
.text-hide {
font: 0/0 a;
color: transparent;
text-shadow: none;
background-color: transparent;
border: 0;
}
.hidden {
display: none !important;
visibility: hidden !important;
}
/*响应式图片*/
.img-responsive {
display: block;
height: auto;
max-width: 100%;
}
/*圆形图片*/
.img-circle {
border-radius: 50%;
}
/* 块状元素水平居中 */
.auto{margin-left:auto; margin-right:auto;}
/* 基于display:table-cell的自适应布局 */
.cell{display:table-cell; *display:inline-block; width:2000px; *width:auto;}
/* 双栏自适应cell部分连续英文字符换行 */
.cell_bk{display:table; width:100%; table-layout:fixed; word-wrap:break-word;}
/* 单行文字溢出虚点显 示*/
.ell{text-overflow:ellipsis; white-space:nowrap; overflow:hidden;}
/* css3过渡动画效果 */
.trans{
-webkit-transition:all 0.3s;
transition:all 0.3s;
}
/* 大小不定元素垂直居中 */
.dib_vm{display:inline-block; width:0; height:100%; vertical-align:middle;}
/* 加载中背景图片 – 如果您使用该CSS小库,务必修改此图片地址 */
.loading{background:url(http://www.zhangxinxu.com/study/image/loading.gif) no-repeat center;}
/* 无框文本框文本域 */
.bd_none{border:0; outline:none;}
/* 绝对定位隐藏 */
.abs_out{position:absolute; left:-999em; top:-999em;}
.abs_clip{position:absolute; clip:rect(0 0 0 0);}
/* 按钮禁用 */
.disabled{color:#acacac!important; border-color:#acacac!important; text-shadow:1px 1px #fff!important; outline:0!important; cursor:default!important; pointer-events:none;}
.disabled:hover{text-decoration:none!important;}
模块类
导航菜单:nav-menu
轮播图:carousel
模式视图:modal
按钮:btn
下拉菜单:dropdown-menu
分页导航:pagination
工具提示:tooltips
分享工具:share
提示窗口:alert
进度条:progress-bar
用户头像:avtar
卡片:card
面板:panel
图片:img
</pre>
</div>
<span class="cnblogs_code_collapse">View Code</span></div>
<p>②多类名</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_fa43ca29-1b4f-4eed-b2c8-87de0cec92f3" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_fa43ca29-1b4f-4eed-b2c8-87de0cec92f3" class="code_img_opened" style="display: none">
<div id="cnblogs_code_open_fa43ca29-1b4f-4eed-b2c8-87de0cec92f3" class="cnblogs_code_hide">
<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)">字符编码</span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">charset</span><span style="color: rgba(0, 0, 255, 1)">="UTF-8"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="viewport"</span><span style="color: rgba(255, 0, 0, 1)"> content</span><span style="color: rgba(0, 0, 255, 1)">="width=device-width, initial-scale=1.0"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>Document<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
.box </span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
width</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 100px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
height</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 100px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
.color-green</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
background-color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> seagreen</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
.color-red</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
background-color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)">darkred</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
.color-blue</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
background-color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> blue</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="box color-green"</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="box color-red"</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="box color-blue"</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<p>(3)id选择器, #id {}</p>
<p>id是唯一的,只能被调用一次。</p>
<p>(4)通配符选择器 * {}</p>
<p>设置所有标签样式</p>
<p><span style="font-size: 15px"><strong>3.1.5 CSS复合选择器</strong></span><br>(1)后代选择器<br>ol li{}<br>ol li a{}<br>(2)子选择器<br>.nav>a{}<br>(3)并集选择器(建议竖着写)<br>div,<br>p{}<br>(4)伪类选择器<br>冒号<br>链接伪类选择器<br>a:link 选择所有未被访问的链接<br>a:visited 选择已经被访问的链接<br>a:hover 选择指针位于其上的链接<br>a:active 选择活动链接(鼠标按下未被弹起的链接)<br><span style="background-color: rgba(0, 255, 0, 1)">为了确保生效,按照上面的顺序依次设置 link,visted,hover,active</span></p>
<p>:focus伪类选择器<br>用于选取获得焦点的表单元素<br>input:focus{}</p>
<h3><span style="font-size: 15px; background-color: rgba(0, 255, 0, 1)">3.1.6 元素显示模式</span></h3>
<p>html元素分为块元素和行内元素<br>(1)块元素<br>常见的有h1~h6,p,div,ul,ol,li<br>特点:<br>·自己独占一行<br>·宽高,外边距以及内边距可以控制<br>·宽度默认是容器(父级宽)的100%<br>·是一个容器及盒子,里面可以放行内或块级元素</p>
<p>注意事项:<br>·文字类的元素不能使用块级元素<br>·p标签主要用于存放文字,因此p里面不能放块级元素,特别不能放<div><br>·同理,h1~h6等都是文字类块级标签,里面也不能放其他块级元素<br>(2)行内元素<br>常见的有a,strong,em,i,span等<br>特点<br>·相邻行内元素显示在一行<br>·高,宽设置无效<br>·默认宽度是其内容的宽度<br>·行内元素只能容纳文本或其他行内元素</p>
<p>注意事项:<br>·链接里不能放链接<br>·<a>可以放块级元素<br>(3)行内块元素<br><img> <input> <td><br>特点:<br>·和相邻行内元素(行内块)在一行上,但是他们之间会有空白间隙。一行可以显示多个(行内元素特点)<br>·默认宽度就是它本身内容的宽度(行内元素特点)<br>·高度,行高,外边距和内边距都可以控制(块级元素特点)<br>(4)显示模式的转换<br>·转换为块元素:display:block<br>·转换为行内元素:display:inline<br>·转换为行内块元素:display:inline-block</p>
<h3><span style="font-size: 15px">3.1.7 CSS三大特性:层叠性,继承性,优先级</span></h3>
<p><strong>层叠性</strong><br>相同选择器设置相同的样式,样式冲突,就近原则(覆盖)</p>
<p><strong>继承性</strong><br>子标签教程父标签的某些样式;<br>子元素可以继承父元素的样式(text-,font,line-这些元素开头的可以继承,以及color属性)</p>
<p>行高继承<br>body{font:12px/1.5 "微软雅黑"} ->1.5行高,当前元素文字大小font-size的1.5倍</p>
<p><strong>优先级</strong><br>·选择器相同,执行层叠性<br>·选择器不同,根据权重<br>*<元素<类<id<行内样式style<!important<br>div{color:pink!important;}<br>继承的样式权重为0</p>
<p> </p>
<div class="cnblogs_code">
<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 128, 0, 1)"><!--</span><span style="color: rgba(0, 128, 0, 1)">字符编码</span><span style="color: rgba(0, 128, 0, 1)">--></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">charset</span><span style="color: rgba(0, 0, 255, 1)">="UTF-8"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="viewport"</span><span style="color: rgba(255, 0, 0, 1)"> content</span><span style="color: rgba(0, 0, 255, 1)">="width=device-width, initial-scale=1.0"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>Document<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
#color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> blue</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
p</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> red</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">id</span><span style="color: rgba(0, 0, 255, 1)">="color"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">p</span><span style="color: rgba(0, 0, 255, 1)">></span>color<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">p</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<p><strong>权重叠加</strong>:如果是复合选择器,则会有权重叠加,需要计算权重</p>
<p><span style="background-color: rgba(0, 255, 0, 1)">各类选择器权重</span>如下:</p>
<table border="1" cellspacing="0">
<tbody>
<tr>
<td valign="top" width="225">
<p>选择器</p>
</td>
<td valign="top" width="128">
<p>选择器权重</p>
</td>
</tr>
<tr>
<td valign="top" width="225">
<p>继承 或者<span style="font-family: Calibri">*</span></p>
</td>
<td valign="top" width="128">
<p>0,0,0,0</p>
</td>
</tr>
<tr>
<td valign="top" width="225">
<p>元素选择器</p>
</td>
<td valign="top" width="128">
<p>0,0,0,1</p>
</td>
</tr>
<tr>
<td valign="top" width="225">
<p>类选择器,伪类选择器</p>
</td>
<td valign="top" width="128">
<p>0,0,1,0</p>
</td>
</tr>
<tr>
<td valign="top" width="225">
<p>id<span style="font-family: 宋体">选择器</span></p>
</td>
<td valign="top" width="128">
<p>0,1,0,0</p>
</td>
</tr>
<tr>
<td valign="top" width="225">
<p>行内样式style=””</p>
</td>
<td valign="top" width="128">
<p>1,0,0,0</p>
</td>
</tr>
<tr>
<td valign="top" width="225">
<p>!important<span style="font-family: 宋体">重要的</span></p>
</td>
<td valign="top" width="128">
<p>∞无穷大</p>
</td>
</tr>
</tbody>
</table>
<p>权重虽然会叠加,但是永远不会有进位</p>
<p>实例</p>
<p>css:</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_96cf7217-c8c3-4de9-9480-debeda36413f" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_96cf7217-c8c3-4de9-9480-debeda36413f" class="code_img_opened" style="display: none">
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<pre><span style="color: rgba(128, 0, 0, 1)"><style>
.nav li</span>{<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> orange</span>;
}<span style="color: rgba(128, 0, 0, 1)">
ul li</span>{<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> red</span>;
}<span style="color: rgba(128, 0, 0, 1)">
li</span>{<span style="color: rgba(255, 0, 0, 1)">
color</span>:<span style="color: rgba(0, 0, 255, 1)"> blue</span>;
}<span style="color: rgba(128, 0, 0, 1)">
</style></span></pre>
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<p>html</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_d75ab54f-2a91-4488-b86a-121631a7c01b" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_d75ab54f-2a91-4488-b86a-121631a7c01b" class="code_img_opened" style="display: none">
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<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">ul </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="nav"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>1<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>2<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>3<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>4<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>5<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">li</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">ul</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<p>最后文字显示为橘色,因为 .nav li的叠加权重为0,0,1,0+0,0,0,1=0,0,1,1最大</p>
<h3><span style="font-size: 15px">3.1.8 盒子模型(Box Model)</span></h3>
<p>页面布局学习的三大核心:盒子模型、浮动、定位</p>
<p>看透网页布局的本质<br>网页布局过程:</p>
<p>(1)先准备好相关的网页元素,网页元素基本都是盒子Box</p>
<p>(2)利用CSS设置好盒子样式,然后摆放到相应位置<br>(3)往盒子里面装内容<br>网页布局的核心本质:就是利用CSS摆盒子</p>
<p>盒子模型的组成<br>所谓盒子模型:就是把HTML页面中的布局元素看作是一个矩形的盒子,也就是一个盛装内容的容器。<br>CSS盒子模型本质上是一个盒子,封装周围的HTML元素,它包括:边框border、外边距margin、内边距padding、和实际内容<br>content</p>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916013150723-2004240181.png" alt="" loading="lazy"></p>
<p> </p>
<p><strong> border</strong></p>
<p>border : border-width | border-style | border-color</p>
<p>border-style:solid /dashed /dotted</p>
<p>border-top/bottom/left/right</p>
<p>表格细边框/合并相邻边框</p>
<p>border-collapse:collapse;</p>
<p><span style="color: rgba(0, 0, 0, 1); background-color: rgba(0, 255, 0, 1)">边框影响盒子大小</span><br>width+border-width*2</p>
<p><strong>padding</strong><br>padding-top/bottom/right/left<br>padding:上右下左/上(左右)下/上下(左右)</p>
<p><span style="background-color: rgba(0, 255, 0, 1)">padding影响盒子大小:如果盒子设置了width/height会撑大盒子</span></p>
<p><strong>margin</strong><br>margin-top/bottom/rignt/left<br>简写方式与padding一样</p>
<p>块级盒子水平居中的条件:<br>·盒子指定了宽度<br>·盒子左右外边距设置为auto<br>·方法<br>margin-left:auto;margin-right:auto;<br>margin:auto;<br>margin:0 auto;</p>
<p>行内元素/行内块元素水平居中<br>给其父元素添加text-align:center</p>
<p><span style="background-color: rgba(0, 255, 0, 1)"><strong>嵌套块元素垂直外边距的塌陷</strong></span></p>
<p>对于两个嵌套关系(父子关系)的块元素,父元素有上外边距同时子元素也有上外边距,此时父元素会塌陷较大的外边距值。</p>
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<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">charset</span><span style="color: rgba(0, 0, 255, 1)">="UTF-8"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="viewport"</span><span style="color: rgba(255, 0, 0, 1)"> content</span><span style="color: rgba(0, 0, 255, 1)">="width=device-width, initial-scale=1.0"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>Document<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
.father</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
width</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)">300px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
height</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 300px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
margin-top</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 20px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
background-color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> grey</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
.son</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
width</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 150px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
height</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 150px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
margin-top</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 10px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
background-color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> orange</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="father"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">class</span><span style="color: rgba(0, 0, 255, 1)">="son"</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<p>解决方案∶</p>
<p>可以为父元素定义上边框。</p>
<p>可以为父元素定义上内边距。</p>
<p>可以为父元素添加overflow:hidden;</p>
<p>还有其他方法,比如浮动、固定,绝对定位的盒子不会有塌陷问题</p>
<p><strong>清除内外边距</strong></p>
<div>
<div>* {</div>
<div> padding: 0;</div>
<div> margin: 0;</div>
<div> }</div>
<div>注意︰行内元素为了照顾兼容性,尽量只设置左右内外边距,不要设置上下内外边距。但是转换为块级和行内块元素就可以了</div>
<div>
<p><strong>圆角边框</strong><br>border-radius:10px;</p>
</div>
<div> </div>
<div><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916033230563-1354319694.png" alt="" loading="lazy">
<p> </p>
<p> 盒子阴影 (box-shadow)</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_b971a0e1-1c1b-4afe-aead-73f1b4c07257" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_b971a0e1-1c1b-4afe-aead-73f1b4c07257" class="code_img_opened" style="display: none">
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<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">charset</span><span style="color: rgba(0, 0, 255, 1)">="UTF-8"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">meta </span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="viewport"</span><span style="color: rgba(255, 0, 0, 1)"> content</span><span style="color: rgba(0, 0, 255, 1)">="width=device-width, initial-scale=1.0"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>Document<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">title</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
div </span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
width</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 200px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
height</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)">200px</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
margin</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 100px auto</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
background-color</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> orange</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 128, 0, 1)">/*</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 128, 0, 1)"> box-shadow: 10px 10px 10px -4px rgba(0, 1, 1, .3); </span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 128, 0, 1)">*/</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(128, 0, 0, 1)">
div:hover </span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">{</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(255, 0, 0, 1)">
box-shadow</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">:</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 255, 1)"> 10px 10px 10px -4px rgba(0, 1, 1, .3)</span><span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">;</span>
<span style="background-color: rgba(245, 245, 245, 1); color: rgba(0, 0, 0, 1)">}</span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">head</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">body</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<div style="height: 200px; width: 200px; background-color: rgba(255, 165, 0, 1); box-shadow: 10px 10px 10px -4px rgba(0, 0, 0, 0.3)"> </div>
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<p><strong> 文字阴影(text-shadow)</strong></p>
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<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div </span><span style="color: rgba(255, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">="font-size: 50px;color: orange;text-shadow: 5px 5px 5px rgba(0,0,0,0.3); "</span><span style="color: rgba(0, 0, 255, 1)">></span>shadow<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<div style="font-size: 50px; color: rgba(255, 165, 0, 1); text-shadow: 5px 5px 5px rgba(0, 0, 0, 0.3)">shadow</div>
<h2><span style="font-size: 16px">3.2浮动</span></h2>
<h3><span style="font-size: 15px">3.2.1概述</span></h3>
<p><strong>传统网页布局的三种方式</strong><br>·普通流(标准流)<br>·浮动<br>·定位</p>
<p>其中普通流布局即标签按照规定好默认方式排列:</p>
<p>1.块级元素会独占一行,从上向下倾序排列。<br>常用元素:div、hr、p、h1~h6、ul、ol、dl、form、table</p>
<p>2.行内元素会按照顺序,从左到右顺序排列,碰到父元素边缘则自动换行。<br>常用元素:span、a、 i、em等</p>
<p>以上都是标准流布局,我们前面学习的就是标准流,标准流是最基本的布局方式。<br>这三种布局方式都是用来摆放盒子的,盒子摆放到合适位置,布局自然就完成了。<br>注意∶实际开发中,一个页面基本都包含了这三种布局方式(后面移动端学习新的布局方式)。</p>
<p><strong>为什么需要浮动?</strong></p>
<p>有很多的布局效果,标准流没有办法完成,此时就可以利用浮动完成布局。因为浮动可以改变元素标<br>签默认的排列方式。</p>
<p>浮动最典型的应用:可以让多个块级元素一行内排列显示。</p>
<p><span style="background-color: rgba(0, 255, 0, 1)">网页布局第一准则:多个块级元素纵向排列找标准流,多个块级元素横向排列找浮动。</span></p>
<p><strong>是什么是浮动?</strong><br>float属性用于创建浮动框,将其移动到一边,直到左边缘或右边缘触及包含块或另一个浮动框的边缘。</p>
<p>float:none/left/right</p>
<h3><span style="font-size: 15px">3.2.2<span style="background-color: rgba(0, 255, 0, 1)">浮动特性</span></span></h3>
<p>加了浮动之后的元素,会具有很多特性,需要我们学握的</p>
<p>(1)浮动元素会脱离标准流(脱标)</p>
<p>①脱离标准普通流的控制(浮)移动到指定位置(动),(俗称脱标)</p>
<p>②浮动的盒子不再保留原先的位置</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_a0986449-7121-4e05-b47e-1ba978c641d3" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_a0986449-7121-4e05-b47e-1ba978c641d3" class="code_img_opened" style="display: none">
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<pre><span style="color: rgba(128, 0, 0, 1)"><style>
.box1 </span>{<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 200px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 200px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> rgba(120, 120, 120, 0.5)</span>;<span style="color: rgba(255, 0, 0, 1)">
float</span>:<span style="color: rgba(0, 0, 255, 1)"> left</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.box2 </span>{<span style="color: rgba(255, 0, 0, 1)">
width</span>:<span style="color: rgba(0, 0, 255, 1)"> 150px</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 150px</span>;<span style="color: rgba(255, 0, 0, 1)">
background-color</span>:<span style="color: rgba(0, 0, 255, 1)"> purple</span>;
}<span style="color: rgba(128, 0, 0, 1)">
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<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916051039112-1945801239.png" alt="" loading="lazy"></p>
<p>(2)浮动的元素会一行内显示并且元素顶部对齐</p>
<p>注意:浮动的元素是互相贴靠在一起的(不会有缝隙),如果父级宽度装不下这些浮动的盒子,多出的盒子<br>会另起一行对齐。</p>
<p>div {float:left}</p>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916051618649-1914017518.png" alt="" loading="lazy"></p>
<p>(3)浮动的元素会具有行内块元素的特性</p>
<p>任何元素都可以浮动。不管原先是什么模式的元素,添加浮动之后具有行内块元素相似的特性。如果行内元素有了浮动,则不需要转换块级/行内块元素就可以直接给高度和宽度。</p>
<p>·如果块级盒子没有设置宽度,默认宽度和父级一样宽,但是添加浮动后,它的大小根据内容来决定</p>
<p>·浮动的盒子中间是没有缝隙的,是紧挨着一起的</p>
<p>·行内元素同理</p>
<h3><span style="font-size: 15px">3.2.3 浮动元素经常和标准流父级搭配使用</span></h3>
<p><span style="background-color: rgba(0, 255, 0, 1)">为了约束浮动元素位置,我们网页布局一般采取的策略是:</span></p>
<p><span style="background-color: rgba(0, 255, 0, 1)">先用标准流的父元素排列上下位置,之后内部子元素采取浮动排列左右位置,符合网页布局第一准则</span></p>
<p> </p>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916052639080-1256438668.png" alt="" loading="lazy"></p>
<p> </p>
<p>练习1</p>
<p>练习2</p>
<p>练习3</p>
<h3><span style="font-size: 15px"> 3.2.4 <span style="background-color: rgba(0, 255, 0, 1)">常见网页布局</span></span></h3>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916054402364-707250318.png" alt="" loading="lazy"><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916054527964-266348107.png" alt="" loading="lazy"></p>
<p><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200916054429460-936696422.png" alt="" loading="lazy"></p>
<h3><span style="font-size: 15px">3.2.5浮动布局注意点</span></h3>
<p>(1)浮动和标准流的父盒子搭配<br>先用标准流的父元素排列上下位置,之后内部子元素采取浮动排列左右位置</p>
<p>(2)一个元素浮动了,理论上其余的兄弟元素也要浮动<br>一个盒子里面有多个子盒子,如果其中一个盒子浮动了,那么其他兄弟也应该浮动,以防止引起问题。</p>
<p>浮动的盒子只会影响浮动盒子后面的标准流不会影响前面的标准流。</p>
<h3><span style="font-size: 15px"> 3.2.6 清除浮动</span></h3>
<p><strong>为什么要清除浮动</strong><br><span style="background-color: rgba(0, 255, 0, 1)">在不适合设置父盒子的场景,需要让子盒子撑开父盒,但是如果父盒子未设置高度,父盒子高度会自动变为0。这样与父盒子同级的标准流盒子,会跑上来,占有父盒子的位置。</span></p>
<p><strong>清除浮动的本质</strong></p>
<p>清除浮动的本质是清除浮动元素脱离标准流造成的影响,如果父盒子本身有高度,则不需要清除浮动。清除浮动之后,父级就会根据浮动的子盒自动检测高度。父级有了高度,就不会影响下面的标准流了。</p>
<p>清除浮动的策略是:闭合浮动</p>
<p>clear:left/right/both</p>
<p><strong>清除浮动的方法</strong><br>(1)额外标签法也称为隔墙法,是W3C推荐的做法。</p>
<p>额外标签法会在浮动元素末尾添加一个空的标签。例如<div style="clear:both”></div>,或者其他标签<br>(如<br/>等)。</p>
<p>优点︰通俗易懂,书写方便</p>
<p>缺点:添加许多无意义的标签,结构化较差</p>
<p>注意︰要求这个新的空标签必须是块级元素。</p>
<p>(2)父级添加overflow属性<br>可以给父级添加overflow属性,将其属性值设置为hidden、auto或scroll。<br>优点:代码简洁</p>
<p>缺点:无法显示溢出的部分</p>
<p>(3)父级添加after伪元素</p>
<p>:after方式是额外标签法的升级版。也是给父元素添加</p>
<div class="cnblogs_code">
<pre><span style="color: rgba(128, 0, 0, 1)">.clearfix:after </span>{<span style="color: rgba(255, 0, 0, 1)">
content </span>:<span style="color: rgba(0, 0, 255, 1)"> ""</span>;<span style="color: rgba(255, 0, 0, 1)">
display</span>:<span style="color: rgba(0, 0, 255, 1)"> block</span>;<span style="color: rgba(255, 0, 0, 1)">
height</span>:<span style="color: rgba(0, 0, 255, 1)"> 0</span>;<span style="color: rgba(255, 0, 0, 1)">
clear</span>:<span style="color: rgba(0, 0, 255, 1)"> both</span>;<span style="color: rgba(255, 0, 0, 1)">
visibility</span>:<span style="color: rgba(0, 0, 255, 1)"> hidden</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.clearfix </span>{<span style="color: rgba(0, 128, 0, 1)">/*</span><span style="color: rgba(0, 128, 0, 1)"> IE6、7专有 </span><span style="color: rgba(0, 128, 0, 1)">*/</span><span style="color: rgba(255, 0, 0, 1)">
*zoom</span>:<span style="color: rgba(0, 0, 255, 1)"> 1</span>;
}</pre>
</div>
<p>优点:没有增加标签,结构更简单</p>
<p>缺点︰照顾低版本浏览器</p>
<p>(4)父级添加双伪元素</p>
<p>给父元素添加:</p>
<div class="cnblogs_code">
<pre><span style="color: rgba(128, 0, 0, 1)">.clearfix:before,.clearfix:after </span>{<span style="color: rgba(255, 0, 0, 1)">
content</span>:<span style="color: rgba(0, 0, 255, 1)">""</span>;<span style="color: rgba(255, 0, 0, 1)">
display</span>:<span style="color: rgba(0, 0, 255, 1)">table</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.clearfix:after </span>{<span style="color: rgba(255, 0, 0, 1)">
clear</span>:<span style="color: rgba(0, 0, 255, 1)">both</span>;
}<span style="color: rgba(128, 0, 0, 1)">
.clearfix </span>{<span style="color: rgba(255, 0, 0, 1)">
*zoom</span>:<span style="color: rgba(0, 0, 255, 1)"> 1</span>;
}</pre>
</div>
<p>优点:代码更简洁 <br>缺点:照顾低版本浏览器</p>
<h3><span style="font-size: 15px">3.2.7 CSS属性书写顺序</span></h3>
<p>建议遵循以下顺序:</p>
<p>1.布局定位属性:display / position / float / clear / visibility / overflow(建议display第一个写,毕竟关系到模式)</p>
<p>2.自身属性: width / height / margin / padding / border / background</p>
<p>3.文本属性:color / font / text-decoration / text-align / vertical-align / white-space / break-word</p>
<p>4.其他属性(CSS3) : content /cursor / border-radius/ box-shadow / text-shadow / background:linear-gradient..</p>
<h3><span style="font-size: 15px"> 3.2.8 <span style="background-color: rgba(0, 255, 0, 1)">页面布局整体思路</span></span></h3>
<p>为了提高网页制作的效率,布局时通常有以下的整体思路:<br>(1)必须确定页面的版心(可视区),我们测量可得知。</p>
<p>(2)分析页面中的行模块,以及每个行模块中的列模块。其是页面布局第一准则。</p>
<p>(3)一行中的列模块经常浮动布局,先确定每个列的大小之后确定列的位置。页面布局第二准则。<br>(4)制作HTML结构。我们还是遵循,先有结构,后有样式的原则。结构永远最重要。</p>
<p> (5)所以,先理清楚布局结构,再写代码尤为重要.这需要我们多写多积累。</p>
<p> </p>
<h2><span style="font-size: 16px">3.3 常用属性</span></h2>
<p><strong>设置字体</strong></p>
<p>font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;</p>
<p>可设置多种字体,寻找浏览器支持字体,优点使用前面的字体。谷歌默认字体为微软雅黑。</p>
<p><strong>设置字体大小</strong></p>
<p>font-size,谷歌默认为16px,因为不同浏览器默认大小不一样,最好设置一下大小。</p>
<p><strong>字体粗细</strong></p>
<p>font-weight:400/normal/700/blod/100-900</p>
<p><strong>字体样式</strong><br>font-style<br>normal/italic</p>
<p><strong>font复合属性/字体复合属性</strong></p>
<p><span style="background-color: rgba(0, 255, 0, 1)">font:font-style font-weght <span style="color: rgba(255, 0, 0, 1)">font-size</span>/line-height <span style="color: rgba(255, 0, 0, 1)">font-family</span></span></p>
<div class="cnblogs_code">
<pre><span style="color: rgba(0, 0, 0, 1)">h1 {
font:bold normal 20px "宋体";
}</span></pre>
</div>
<p><strong>文本颜色</strong><br>color:red;<br>color:#ff0000;<br>color:rgb(255,0,0)</p>
<p><strong>文本对齐/对齐文本</strong><br>text-align:left/center/right 水平对齐方式</p>
<p><strong>文本装饰/装饰文本</strong><br>text-decoration:none/underline/overline/line-throught</p>
<div class="cnblogs_code">
<pre><span style="color: rgba(0, 0, 0, 1)">a {
text-decoration: none;
}</span></pre>
</div>
<p><strong>文本缩进</strong><br>text-indent:10px/2em 针对首行缩进</p>
<p><strong>行间距</strong><br>line-height:26px;</p>
<p> <img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200915061118483-1440084655.png" alt="" loading="lazy"></p>
<p> </p>
<p> </p>
<p><strong>单行文字垂直居中</strong><br>设置行高line-height为盒子高度</p>
<p>行高可以继承,父元素设置了行高,会继承给子元素</p>
<p><strong>背景颜色</strong><br>background-color:transparent(默认透明)<br><strong>背景图片</strong><br>background-image:none|url(url)<br><strong>背景图片平铺</strong><br>background-repeat:repeat|no-repeat|repeat-x|repeat-y<br><strong>背景位置</strong><br>background-position:x y; <br>(1)可以设置方位名词,top|center|botton|left...<br>设置两个方位名词 right center和center right效果是等价的,与顺序无关;也可以只设置一个方位名词,另一个默认是center<br>(2)设置为精确单位<br>background-position: 20px 50px<br>(3)使用混合单位<br>background-postion:20px center<br><strong>背景固定</strong><br>background-attachment:scroll/fixed<br>设置背景图像是否固定或者随着页面其余部分滚动,默认为滚动<br><strong>背景属性复合写法</strong><br>background,没有顺序要求<br><strong>背景色半透明/背景透明</strong><br>background:rgba(0,0,0,.3)</p>
<p> </p>
<h1><span style="font-size: 18px">4.HTML标签(用于查询ctrl+f)</span></h1>
<p><strong>页面标题</strong></p>
<p>title</p>
<p><strong>分级标题</strong></p>
<p>h1-h6</p>
<p><strong>线</strong></p>
<p>hr</p>
<p><strong>段落</strong></p>
<p>p</p>
<p><strong>换行</strong></p>
<p><br /></p>
<p><strong>加粗</strong></p>
<p>strong/b</p>
<p><strong>倾斜</strong><br>em/i</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_b306293f-ef14-4f00-b479-ae8d8ad49fdc" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_b306293f-ef14-4f00-b479-ae8d8ad49fdc" class="code_img_opened" style="display: none">
<div id="cnblogs_code_open_b306293f-ef14-4f00-b479-ae8d8ad49fdc" class="cnblogs_code_hide">
<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">em </span><span style="color: rgba(255, 0, 0, 1)">style</span><span style="color: rgba(0, 0, 255, 1)">="font-style: normal; color: orange;"</span><span style="color: rgba(0, 0, 255, 1)">></span>|<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">em</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">div</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
</div>
<span class="cnblogs_code_collapse">View Code</span></div>
<div><em style="font-style: normal; color: rgba(255, 165, 0, 1)">|</em></div>
<p><strong>删除线</strong><br>del/s</p>
<p><strong>下划线</strong><br>ins/u</p>
<p><strong>盒子</strong><br>div:换行<br>span:不换行</p>
<p><strong>图像/图片</strong></p>
<div><img src="pic/w.jpg" alt="w" title="model" width="400" border="3"/></div>
<div><img src="https://i.cnblogs.com/assets/adminlogo.gif" alt="w" title="model" width="400" border="3"/></div>
<p><strong>超链接</strong></p>
<div>
<div><a href="https://www.cnblogs.com/vocus/" target="_blank">vocus's blog</a> </div>
<div><a href="https://www.cnblogs.com/vocus/" target="_self">vocus's blog</a></div>
<div>
<div><a href="https://files.cnblogs.com/files/vocus/json-lib-2.4&dependencies_jars.rar" target="_self">download</a></div>
<div><strong>锚点跳转</strong></div>
<div>
<p><a href="#two">跳转</a><br><h6 id="two">跳转到这里...</h6></p>
<p>测试:概述</p>
</div>
</div>
</div>
<div><strong>注释</strong></div>
<div>
<div><!--注释--></div>
<div>特殊字符/字符实体</div>
<div>https://www.w3school.com.cn/html/html_entities.asp</div>
<div><strong>表格</strong></div>
<div><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200915024547571-1882374707.png" alt="" loading="lazy"><img src="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200915024557994-447955880.png" alt="" loading="lazy"></div>
<div>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_9fa0e931-8f1c-4508-afdb-a1907b66ebaa" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_9fa0e931-8f1c-4508-afdb-a1907b66ebaa" class="code_img_opened" style="display: none">
<div id="cnblogs_code_open_9fa0e931-8f1c-4508-afdb-a1907b66ebaa" class="cnblogs_code_hide">
<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">table </span><span style="color: rgba(255, 0, 0, 1)">align</span><span style="color: rgba(0, 0, 255, 1)">="center"</span><span style="color: rgba(255, 0, 0, 1)"> width</span><span style="color: rgba(0, 0, 255, 1)">="560"</span><span style="color: rgba(255, 0, 0, 1)"> cellpadding</span><span style="color: rgba(0, 0, 255, 1)">="2"</span><span style="color: rgba(255, 0, 0, 1)"> border</span><span style="color: rgba(0, 0, 255, 1)">="1"</span><span style="color: rgba(255, 0, 0, 1)"> cellspacing</span><span style="color: rgba(0, 0, 255, 1)">="0"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>Aug 2020<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>Aug 2019<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>Change<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>Programming Language<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>Ratings<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">th</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>1<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>2<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">img </span><span style="color: rgba(255, 0, 0, 1)">src</span><span style="color: rgba(0, 0, 255, 1)">="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200915024547571-1882374707.png"</span><span style="color: rgba(0, 0, 255, 1)">/></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>C<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>16.98%<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>2<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>1<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">img </span><span style="color: rgba(255, 0, 0, 1)">src</span><span style="color: rgba(0, 0, 255, 1)">="https://img2020.cnblogs.com/blog/1744377/202009/1744377-20200915024557994-447955880.png"</span><span style="color: rgba(0, 0, 255, 1)">/></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>Java<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>14.43%<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>3<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>3<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>Python<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>9.69%<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">table</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<span class="cnblogs_code_collapse">View Code</span></div>
<p><strong>表格结构标签</strong><br>thead:头部区域<br>tbody:主体区域<br><table><thead><tr><th></th></tr></thead><tbody><tr><td></td></tr></tbody></table></p>
<p><strong>合并单元格</strong></p>
<p>跨行合并;rowspan<br>扩列合并:colspan</p>
<div class="cnblogs_code"><img src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" id="code_img_closed_e77c5b85-572b-470c-94c5-4284081b4302" class="code_img_closed"><img src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" id="code_img_opened_e77c5b85-572b-470c-94c5-4284081b4302" class="code_img_opened" style="display: none">
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<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">table </span><span style="color: rgba(255, 0, 0, 1)">border</span><span style="color: rgba(0, 0, 255, 1)">="1"</span><span style="color: rgba(255, 0, 0, 1)"> cellspacing</span><span style="color: rgba(0, 0, 255, 1)">="0"</span><span style="color: rgba(255, 0, 0, 1)"> width</span><span style="color: rgba(0, 0, 255, 1)">="400"</span><span style="color: rgba(255, 0, 0, 1)"> height</span><span style="color: rgba(0, 0, 255, 1)">="400"</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>1<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>2<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td </span><span style="color: rgba(255, 0, 0, 1)">rowspan</span><span style="color: rgba(0, 0, 255, 1)">="2"</span><span style="color: rgba(0, 0, 255, 1)">></span>3<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td </span><span style="color: rgba(255, 0, 0, 1)">colspan</span><span style="color: rgba(0, 0, 255, 1)">="2"</span><span style="color: rgba(0, 0, 255, 1)">></span>4<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>5<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>6<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>7<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">table</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<p><strong>无序列表</strong><br><ul><li></p>
<p>去掉导航圆点:</p>
<p>li{list-style:none}</p>
<p><strong>有序列表</strong><br><ol><li></p>
<p><strong>自定义列表</strong><br><dl><dt></dt><dd></dd><dd></dd></dl></p>
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<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dl</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dt</span><span style="color: rgba(0, 0, 255, 1)">></span>分类<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dt</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>子类1<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>子类2<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>子类3<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dd</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">dl</span><span style="color: rgba(0, 0, 255, 1)">></span></pre>
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<p><strong> 表单</strong></p>
<p>https://www.w3school.com.cn/tags/tag_input.asp</p>
<p> 表单域,表单控件,提示信息</p>
<p><form action=url method="post/get" name=""></p>
<p>输入框,name(用于区别不同的表单元素),value,maxlength(最大输入字符)<br><input type="text"/></p>
<p>密码框,name,value<br><input type="text"/></p>
<p>单选按钮,name值相同才能实现多选一,value,checked<br><input type="radio"/></p>
<p>复选按钮,name值一样,后台判断选择的是哪一个,value,checked<br><input type="checkbox"/></p>
<p>提交按钮<br><input type="submit" value="提交"><br>重置按钮<br><input type="reset" value="重置"><br>按钮<br><input type="reset" value="按钮"><br>文件上传<br><input type="file"></p>
<p><strong>label标签</strong><br>将label的for属性与元素的id属性设置为相同的值,实现文本和表单元素绑定</p>
<div><label for="man">男</label><input type="radio" id="man"/>(点击文字,选中单选按钮)</div>
<div>
<p>下拉框/下拉表单元素,selected="selected"<br><select><option></p>
<p><strong>文本域</strong><br><textarea rows="" cols=""</p>
<p><strong>表单的例子</strong></p>
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<pre><span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>青春不常在,抓紧谈恋爱<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">h4</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">form</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">table</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>性别<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">label </span><span style="color: rgba(255, 0, 0, 1)">for</span><span style="color: rgba(0, 0, 255, 1)">="man"</span><span style="color: rgba(0, 0, 255, 1)">></span>男<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">label</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">input </span><span style="color: rgba(255, 0, 0, 1)">type</span><span style="color: rgba(0, 0, 255, 1)">="radio"</span><span style="color: rgba(255, 0, 0, 1)"> id</span><span style="color: rgba(0, 0, 255, 1)">="man"</span><span style="color: rgba(0, 0, 255, 1)">/><</span><span style="color: rgba(128, 0, 0, 1)">label </span><span style="color: rgba(255, 0, 0, 1)">for</span><span style="color: rgba(0, 0, 255, 1)">="man"</span><span style="color: rgba(0, 0, 255, 1)">></span>女<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">label</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">input </span><span style="color: rgba(255, 0, 0, 1)">type</span><span style="color: rgba(0, 0, 255, 1)">="radio"</span><span style="color: rgba(255, 0, 0, 1)"> id</span><span style="color: rgba(0, 0, 255, 1)">="woman"</span><span style="color: rgba(0, 0, 255, 1)">/></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>生日<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">select</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option </span><span style="color: rgba(255, 0, 0, 1)">selected</span><span style="color: rgba(0, 0, 255, 1)">="selected"</span><span style="color: rgba(0, 0, 255, 1)">></span>--选择年份--<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>2010<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>2011<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>2012<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">select</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">select</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option </span><span style="color: rgba(255, 0, 0, 1)">selected</span><span style="color: rgba(0, 0, 255, 1)">="selected"</span><span style="color: rgba(0, 0, 255, 1)">></span>--选择月份--<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>1<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>2<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>3<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">select</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">select</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option </span><span style="color: rgba(255, 0, 0, 1)">selected</span><span style="color: rgba(0, 0, 255, 1)">="selected"</span><span style="color: rgba(0, 0, 255, 1)">></span>--选择日期--<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>11<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>12<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>13<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">option</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">select</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>选择婚姻状况:<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">input </span><span style="color: rgba(255, 0, 0, 1)">type</span><span style="color: rgba(0, 0, 255, 1)">="checkbox"</span><span style="color: rgba(255, 0, 0, 1)"> name</span><span style="color: rgba(0, 0, 255, 1)">="marry"</span><span style="color: rgba(255, 0, 0, 1)"> id</span><span style="color: rgba(0, 0, 255, 1)">="yihun"</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">label </span><span style="color: rgba(255, 0, 0, 1)">for</span><span style="color: rgba(0, 0, 255, 1)">="yihun"</span><span style="color: rgba(0, 0, 255, 1)">></span>已婚<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">label</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">input </span><span style="color: rgba(255, 0, 0, 1)">type</span><span style="color: rgba(0, 0, 255, 1)">="checkbox"</span><span style="color: rgba(255, 0, 0, 1)"> checked</span><span style="color: rgba(0, 0, 255, 1)">="checked"</span><span style="color: rgba(255, 0, 0, 1)"> name</span><span style="color: rgba(0, 0, 255, 1)">="marry"</span><span style="color: rgba(255, 0, 0, 1)"> id</span><span style="color: rgba(0, 0, 255, 1)">="weihun"</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">label </span><span style="color: rgba(255, 0, 0, 1)">for</span><span style="color: rgba(0, 0, 255, 1)">="weihun"</span><span style="color: rgba(0, 0, 255, 1)">></span>未婚<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">label</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">input </span><span style="color: rgba(255, 0, 0, 1)">type</span><span style="color: rgba(0, 0, 255, 1)">="checkbox"</span><span style="color: rgba(255, 0, 0, 1)">name</span><span style="color: rgba(0, 0, 255, 1)">="marry"</span><span style="color: rgba(255, 0, 0, 1)"> id</span><span style="color: rgba(0, 0, 255, 1)">="liyi"</span><span style="color: rgba(0, 0, 255, 1)">><</span><span style="color: rgba(128, 0, 0, 1)">label </span><span style="color: rgba(255, 0, 0, 1)">for</span><span style="color: rgba(0, 0, 255, 1)">="liyi"</span><span style="color: rgba(0, 0, 255, 1)">></span>离异<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">label</span><span style="color: rgba(0, 0, 255, 1)">></</span><span style="color: rgba(128, 0, 0, 1)">td</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"></</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
<span style="color: rgba(0, 0, 255, 1)"><</span><span style="color: rgba(128, 0, 0, 1)">tr</span><span style="color: rgba(0, 0, 255, 1)">></span>
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来源:https://www.cnblogs.com/vocus/p/13670467.html
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