vue单页面返回父页面时，父页面缓存状态

1、在router定义中增加meta{keepAlive:true}

{
   path: '/app',
   name: 'app',
   component: pages['App'],
   meta: { keepAlive: true}
},

2、router-view区分对待

<keep-alive>
 <router-view v-if="$route.meta.keepAlive"></router-view>
</keep-alive>
<router-view v-if="!$route.meta.keepAlive"></router-view>

3 、子页面中增加beforeRouteLeave

  beforeRouteLeave(to, from, next){
    // 再次指定使用keepAlive特性
    to.meta.keepAlive = true
    next()
    setTimeout(function (){
      // 取消keepAlive特性，由其他父路由转到to的路由时，to的页面需要刷新
      to.meta.keepAlive = false
    },1000)

4、子页面数据更改，父页面需要刷新时
父页面

  activated() {
    const apps = JSON.parse(sessionStorage.getItem('apps'));
    if (apps != null) {
      this.initAppList();
    }
    sessionStorage.removeItem("apps");
  },

子页面，数据改变时标记

this.$message.success('操作成功！')

sessionStorage.setItem('apps',"true");

因为用的sessionStorage，所以使用视具体情况吧

5、参照
https://blog.youkuaiyun.com/yan263364/article/details/84402595
https://www.cnblogs.com/ivy-zheng/p/13306789.html