1 template div class="home" !-- 首先将要过渡的元素用transition包裹,并设置过渡的name -- transition name="mybox" div class="box" v-show="boxshow"/div /transition button @click="togglebox"按钮/button /div/template 2 data(
          1
<template> <div class="home"> <!-- 首先将要过渡的元素用transition包裹,并设置过渡的name --> <transition name="mybox"> <div class="box" v-show="boxshow"></div> </transition> <button @click="togglebox">按钮</button> </div> </template>
2
data() {
  return {
   boxshow: false,
  };
 },
3
methods: {
  togglebox: function () {
   this.boxshow = !this.boxshow;
  },
 },
样式:
<style lang="scss" scoped>
.box {
 height: 500px;
 background-color: rgb(245, 224, 224);
 overflow: hidden;
}
/* 给过渡的name加样式 */
.mybox-leave-active,
.mybox-enter-active {
 transition: all 1s ease;
}
.mybox-leave-active,
.mybox-enter {
 height: 0px !important;
}
.mybox-leave,
.mybox-enter-active {
 height: 500px;
}
</style>
效果

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