vue keep-alive请求数据的方法示例

   beforeRouteEnter(to, from, next) {   //判断从index页面进入，将list的isBack设置为true   //这样就可以请求数据了     if (from.name == 'index') {      to.meta.isBack = true;     }     next();   },   activated: function () {     if (this.$route.meta.isBack || this.isFirstEnter) {      //清理已有商品列表的数据，重新请求数据，如果不清除的话就会有之前的商品缓存，延迟显示最新的商品      this.proData = [];      //请求数据      this.fetchData();     }     //重新设置当前路由的isBack     this.$route.meta.isBack = false;     //重新设置是否第一次进入     this.isFirstEnter = false;   },   mounted: function () {    //如果是第一次进入，或者刷新操作的话，也请求数据     this.isFirstEnter = true;   },

const appRouter = { mode: "history", base: "/m/", routes: [  {   path: "",   redirect: "/index"  },  {   path: "/index",   name: "index",   component: Index,   meta: {    keepAlive: true   }  },    {   path: "/list",   name: "list",   component: List,   meta: {    keepAlive: true,    isBack: false //isback是true的时候请求数据，或者第一次进入的时候请求数据   }  },  {   path: "/product/:id",   name: "product",   component: Product,   meta: {    keepAlive: false   }  }   ]};Vue.use(Router);export default new Router(appRouter);