Vue过渡：CSS过渡

一 项目结构

二 App.vue

<template>
  <div id="app">
    <transition name="fade">
      <mongo v-if="show"/>
    </transition>
    <button @click="toggle">按钮</button>
  </div>
</template>

<script>
import Vue from "vue";
import Mongo from "./components/Mongo";
export default {
  name: "app",
  data() {
    return {
      show: true
    };
  },
  methods: {
    toggle() {
      this.show = !this.show;
    }
  },
  components: { Mongo }
};
</script>

<style>
</style>

三 Mongo.vue

<template>
    <div class="title">mongo</div>
</template>
<script>
export default {};
</script>
<style scoped>
.title {
  width: 100px;
  line-height: 26px;
  font-size: 16px;
  color: blue;
}
.fade-enter,
.fade-leave-to {
  opacity: 0;
}
.fade-enter-active,
.fade-leave-active {
  transition: opacity 0.5s ease-in-out;
}
</style>

四 运行效果