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);