vue-router中关于meta的作用及说明

const router = new VueRouter({
  routes: [
    {
      path: '/foo',
      component: Foo,
      children: [
        {
          path: 'bar',
          component: Bar,
          // a meta field
          meta: { requiresAuth: true }
        }
      ]
    }
  ]
})

router.beforeEach((to, from, next) => {
  if (to.matched.some(record => record.meta.requiresAuth)) {
    // this route requires auth, check if logged in
    // if not, redirect to login page.
    if (!auth.loggedIn()) {
      next({
        path: '/login',
        query: { redirect: to.fullPath }
      })
    } else {
      next()
    }
  } else {
    next() // 确保一定要调用 next()
  }
})

{
    path:"/test",
    name:"test",
    component:()=>import("@/components/test"),
    meta:{
        title:"测试页面", //配置title
        keepAlive: true //是否缓存
    }
}

//main.js中的代码
router.beforeEach((to,from,next)=>{
    if(to.meta.title){
        document.title=to.meta.title
    }
    next()
})

<!-- app.vue中的代码 -->
<!-- 需要被缓存的路由入口 -->
<keep-alive>  
    <router-view v-if="$route.meta.keepAlive"></router-view>
</keep-alive>
<!-- 不需要被缓存的路由入口 -->
<router-view v-if="!$route.meta.keepAlive"></router-view>