JingTieXueTang.H5/src/App.vue

<template>
  <div :class="{ fullscreen: isFullscreen }">
    <template>
      <transition name="router-fade" mode="out-in">
        <keep-alive>
          <router-view v-if="$route.meta.keepAlive"></router-view>
        </keep-alive>
      </transition>
      <transition name="router-fade" mode="out-in">
        <router-view v-if="!$route.meta.keepAlive"></router-view>
      </transition>
    </template>
  </div>
</template>

<script>
export default {
  name: "app",
  data() {
    return {
      isFullscreen: false // 是否全屏
    };
  }
};
</script>
<style lang="scss">
.router-fade-enter-active,
.router-fade-leave-active {
  transition: opacity 0.3s;
}
.router-fade-enter,
.router-fade-leave-to {
  opacity: 0;
}
.fullscreen {
  .van-nav-bar {
    background-color: red;
  }
}
</style>