sass 常用备忘案例详解
<h3>一、变量</h3><p>所有变量以$开头</p>
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<pre class="brush:css;">
$font_size: 12px;
.container{
font-size: $font_size;
}</pre>
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<p>如果变量嵌套在字符串中，需要写在#{}中</p>
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$side : left;
.rounded {
border-#{$side}: 1px solid #000;
}</pre>
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<h3>二、嵌套</h3>
<p>层级嵌套</p>
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<pre class="brush:css;">
.container{
display: none;
.header{
width: 100%;
}
}</pre>
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<p>属性嵌套，注意，border后需要加上冒号:</p>
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<pre class="brush:css;">
.container {
border: {
width: 1px;
}
}</pre>
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<p> 可以通过&引用父元素，常用在各种伪类</p>
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<pre class="brush:css;">
.link{
&:hover{
color: green;
}
}</pre>
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<h3>三、mixin</h3>
<p>简单理解，是可以重用的代码块，通过@include 命令</p>
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// mixin
@mixin focus_style {
outline: none;
}
div {
@include focus_style;
}</pre>
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<p><span style="line-height: 1.5">编译后生成</span></p>
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div {
outline: none; }
</pre>
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<p>还可指定参数、缺省值</p>
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// 参数、缺省值
@mixin the_height($h: 200px) {
height: $h;
}
.box_default {
@include the_height;
}
.box_not_default{
@include the_height(100px);
}</pre>
</div>
<p>编译后生成</p>
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<pre class="brush:css;">
.box_default {
height: 200px; }
.box_not_default {
height: 100px; }</pre>
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<h3><span style="font-size: 1.17em; line-height: 1.5">四、继承</span></h3>
<p>通过@extend，一个选择器可以继承另一个选择器的样式。例子如下</p>
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<pre class="brush:css;">
// 继承
.class1{
float: left;
}
.class2{
@extend .class1;
width: 200px;
}</pre>
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<p>编译后生成</p>
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<pre class="brush:css;">
.class1, .class2 {
float: left; }
.class2 {
width: 200px; }
</pre>
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<h3>五、运算</h3>
<p>直接上例子</p>
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<pre class="brush:css;">
.container{
position: relative;
height: (200px/2);
width: 100px + 200px;
left: 50px * 2;
top: 50px - 10px;
}</pre>
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<p>编译后生成</p>
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<pre class="brush:css;">
.container {
position: relative;
height: 100px;
width: 300px;
left: 100px;
top: 40px; }</pre>
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<h3>插入文件</h3>
<p>用@import 来插入外部文件</p>
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@import "outer.scss";
</pre>
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<p>也可插入普通css文件</p>
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@import "outer.css";</pre>
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<h3>自定义函数</h3>
<p>通过@function 来自定义函数</p>
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<pre class="brush:css;">
@function higher($h){
@return $h * 2;
}
.container{
height: higher(100px);
}</pre>
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<p>编译后输出</p>
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<pre class="brush:css;">
.container {
height: 200px;
}</pre>
</div>
<h3>注释</h3>
<p>两种风格的注释</p>
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// 单行注释，编译后消失</pre>
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/* 标准的CSS注释，会保留到编译后的代码中 */</pre>
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<p>如果重要的注释，<span style="text-decoration: underline">压缩编译</span>后还想保留，可在 /* 后面加上 !</p>
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/*!
重要注释，压缩编译也不会消失
*/</pre>
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<p>参考：</p>
<p><a href="http://www.ruanyifeng.com/blog/2012/06/sass.html" rel="external nofollow"target="_blank">http://www.ruanyifeng.com/blog/2012/06/sass.html</a></p>
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