keep-alive前进调用接口，后退显示缓存

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

{
	path: "/index",
	name: "index",
	component: () =>
		import ("../views/index.vue"),
	meta: {
		title: "首页",
		keepAlive: true, true设置缓存，flase不设置
	}
}

beforeRouteEnter(to, from, next) {
    to.meta.keepAlive = true;
    if (from.path !== "/index") {
      to.meta.keepAlive = true;
	  next();
    } else {
      from.meta.keepAlive = false;
      next();
    }
},
beforeRouteLeave(to, from, next) {
    if (to.path === "/index") {
      from.meta.keepAlive = true;
      next();
    } else {
      from.meta.keepAlive = false;
      next();
    }
},