cr/src/App.vue

<template>
<div id="app">
  <transition name="fade" mode="out-in">
    <router-view></router-view>
  </transition>
</div>
</template>

<script>
export default {
  name: 'app',
  components: {}
}
</script>

<style>
body {
    margin: 0;
    padding: 0;
    font-family: Helvetica Neue, Helvetica, PingFang SC, Hiragino Sans GB, Microsoft YaHei, SimSun, sans-serif;
    font-size: 13px;
    -webkit-font-smoothing: antialiased;
}
 
#app {
    top: 0;
    bottom: 0;
    width: 100%;
    min-width: 1320px;
}
 
.fade-enter-active,
.fade-leave-active {
    transition: all 0.2s ease;
}
 
.fade-enter,
.fade-leave-active {
    opacity: 0;
}
</style>