{//主頁
 path: '/',
  name: 'Home',
  component: () => import(/* webpackChunkName: "about" */ '../views/Home.vue'),
  meta: {
    title: 'Home',
    keepAlive: true
  },
  beforeRouteLeave: (to, from, next) => {
    console.log(to.meta);
  }
}

<!-- 這是vue3的寫法，與vue2的寫法有所區(qū)別，如果這里使用vue2.x寫法，會有警告 -->
<router-view v-slot="{ Component }">
  <keep-alive>
    <component :is="Component" :key="$route.name" v-if="$route.meta.keepAlive" />
  </keep-alive>
  <component :is="Component" :key="$route.name" v-if="!$route.meta.keepAlive" />
</router-view>

  <div id="app">
  	<keep-alive>
	    <tar-bar></tar-bar>
	    <div class="container">
	      <left-menu></left-menu>
	      <Main />
	    </div>
    </keep-alive>
  </div>

// 1. 將緩存 name 為 cc 的組件,如果有多個(gè)，可用逗號分
  	<keep-alive include='cc，cc1,cc2'>
      <router-view/>
    </keep-alive>
    
// 2. 將不緩存 name 為 cc 的組件
	<keep-alive exclude='cc'>
  	  <router-view/>
	</keep-alive>
	
// 3. 還可使用屬性綁定動(dòng)態(tài)判斷
	<keep-alive :include='includedComs'>
  	  <router-view/>
	</keep-alive>

 const routes = [
  {
    path:'/',
    component:Home,
    meta:{
        keepalive:true
    }
  },
  {
    path:'/login',
    component:Login
  },
   {
      path:'/edit',
      component:Edit,
      meta:{
          istoken: true
      }
   },
  {
      path:'/home',
      component:Home,
      meta:{
          keepalive:true
      }
  }
]

<div id="app">
    <!--keep-alive 表示頁面不會被銷毀，即保持頁面狀態(tài)-->
    <keep-alive>
      <router-view v-if="$route.meta.keepalive"></router-view>
    </keep-alive>
    <router-view v-if="!$route.meta.keepalive"></router-view>
 </div>

	<router-view v-slot="{ Component }">
	  <keep-alive>
	    <component :is="Component"/>
	  </keep-alive>
	</router-view>

<template>
	<router-view v-slot="{ Component }">
	  <keep-alive :include="includeList">
	    <component :is="Component"/>
	  </keep-alive>
	</router-view>
</template>

<script>
import { reactive, watch, toRefs } from '@vue/runtime-core'
import { useRoute, useRouter }
  export default {
    name: 'Test',
    setup(){
      const state = reactive({
        includeList: []
      })
      const route = useRoute()
      // const router = useRouter()
      watch(() => route,(newVal,oldVal)=>{
        if(newVal.meta.keepAlive && state.includeList.indexOf(newVal.name) === -1){
          state.includeList.push(newVal.name);
          console.log(state.includeList);
        }
      },{deep:true}) // 開啟深度監(jiān)聽
      return{
        ...toRefs(state)
      }
    }
  }
</script>

	{
	  path: 'test',
	  name: 'Test',
	  component: () => import('@/views/Test'),
	  meta: {
	    keepAlive: true, // 組件需要緩存
	  }
	},