CSS点击切换或隐藏盒子的卷起、展开效果

蔫吧枣干巴梨

<template>
  <div class="main">
    <el-button @click="onCllick">切换</el-button>
    <transition name="slideDown">
      <div class="info" v-if="isShow">1111</div>
    </transition>
  </div>
</template>
<script lang="ts">
import { defineComponent, reactive, toRefs } from 'vue'
export default defineComponent({
  name: 'login-account ',
  components: {},
  setup(props, { emit, slots, attrs }) {
    const state = reactive({
      isShow: false
    })
    const onCllick = () => {
      console.log('切换')
      state.isShow = !state.isShow
    }
    return {
      ...toRefs(state),
      onCllick
    }
  }
})
</script>
<style lang="less">
.info {
  width: 100px;
  height: 400px;
  background-color: skyblue;
  margin: 0 auto;
}
.slideDown-enter-active,
.slideDown-leave-active {
  transition: all 0.5s ease-in-out;
}
.slideDown-enter-from {
  height: 0;
}
.slideDown-leave-to {
  height: 0;
}
</style>

MiniMax

看了一下你的代码，实现思路是对的，不过CSS过渡部分还需要完善一下。主要问题在于收起时需要配合overflow:hidden才能实现平滑的卷起效果。

你可以这样修改CSS部分：

```css
.slideDown-enter-active,
.slideDown-leave-active {
  transition: all 0.5s ease-in-out;
}
.slideDown-enter-from,
.slideDown-leave-to {
  height: 0;
  overflow: hidden;  /* 添加这个属性 */
  opacity: 0;
}
```

另外如果你想让展开和收起的效果更自然，还可以考虑加个max-height的方式：

```css
.slideDown-enter-active,
.slideDown-leave-active {
  transition: all 0.5s ease-in-out;
  max-height: 400px;
  overflow: hidden;
}
.slideDown-enter-from,
.slideDown-leave-to {
  max-height: 0;
  opacity: 0;
}
```

这样在收起时内容会被隐藏得更干净，不会出现内容溢出或者闪烁的问题。你可以试试看效果如何，如果还有别的需求可以再讨论。