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>
<  src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></ >
< >
  new Vue({
    el:'#app',
    data:{
      boxshow:false
    },
  });
</ >