基于vue展开收起动画的示例代码

<!--css-->
.box{
 height:200px;width: 200px;
 background-color:black;
}
.draw-enter-active, .draw-leave-active {
 transition: all 1s ease;
}
.draw-enter, .draw-leave-to /* .fade-leave-active below version 2.1.8 */ {
 height: 0;
}

<div id="app">
 <button @click="boxshow = !boxshow">点击展开/关闭</button>
 <transition name="draw"> <!--这里的name 和 css 类名第一个字段要一样-->
 <div class="box" v-show="boxshow"></div>
 </transition>
</div>
</body>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
<script>
 new Vue({
 el:'#app',
 data:{
 boxshow:false
 },
 });
</script>