import Vue from 'vue/dist/vue.js'
import App from './App.vue'
import VueRouter from 'vue-router';

const Index = { template: '<div>Index</div>' }
const routes = [
 // 含有iframe的两个页面
 {
 path: '/f1',
 name: 'f1'
 },
 // 含有iframe的两个页面
 {
 path: '/f2',
 name: 'f2'
 },
 {
 path: '/index',
 component: Index
 }
]

const router = new VueRouter({
 routes
});

Vue.use(VueRouter);
new Vue({
 render: h => h(App),
 router
}).$mount('#app')

<template>
 <div id="app">
 <div class="nav">
  <router-link class="router" to="/f1">Go to F1</router-link>
  <router-link class="router" to="/f2">Go to F2</router-link>
  <router-link class="router" to="/index">Go to Index</router-link>
 </div>
 
 <keep-alive>
  <!-- Vue的路由 -->
  <router-view></router-view>
 </keep-alive>
 
 <!-- iframe页面 -->
 <f1 v-show="$route.path == '/f1'"></f1>
 <f2 v-show="$route.path == '/f2'"></f2>
 </div>
</template>

<script>
import F1 from './components/f1';
import F2 from './components/f2';
export default {
 name: 'app',
 components: {
 F1,
 F2
 },
 
}
</script>

import F1 from './components/f1';
import F2 from './components/f2';

const routes = [
 {
 path: '/f1',
 name: 'f1',
 iframeComponent: F1 // 用于标识是否含有iframe页
 },
 {
 path: '/f2',
 name: 'f2',
 iframeComponent: F2 // 用于标识是否含有iframe页
 },
 {
 path: '/index',
 component: { template: '<div>Index</div>' }
 }
]

const router = new VueRouter({
 routes // （缩写）相当于 routes: routes
});

new Vue({
 render: h => h(App),
 router
}).$mount('#app')

<template>
 <div>
  <!-- Vue的router-view -->
  <keep-alive>
   <router-view></router-view>
  </keep-alive>

  <!-- iframe页 -->
  <component
   v-for="item in hasOpenComponentsArr"
   :key="item.name"
   :is="item.name"
   v-show="$route.path === item.path"
  ></component>
 </div>
</template>

<script>
import Vue from 'vue/dist/vue.js'
export default {
 created() {
  // 设置iframe页的数组对象
  const componentsArr = this.getComponentsArr();
  componentsArr.forEach((item) => {
   Vue.component(item.name, item.component);
  });
  this.componentsArr = componentsArr;
  // 判断当前路由是否iframe页
  this.isOpenIframePage();
 },
 data() {
  return {
   componentsArr: [] // 含有iframe的页面
  }
 },
 watch: {
  $route() {
   // 判断当前路由是否iframe页
   this.isOpenIframePage();
  }
 },
 computed: {
  // 实现懒加载，只渲染已经打开过（hasOpen:true）的iframe页
  hasOpenComponentsArr() {
   return this.componentsArr.filter(item => item.hasOpen);
  }
 },
 methods: {
  // 根据当前路由设置hasOpen
  isOpenIframePage() {
   const target = this.componentsArr.find(item => {
    return item.path === this.$route.path
   });
   if (target && !target.hasOpen) {
    target.hasOpen = true;
   }
  },
  // 遍历路由的所有页面，把含有iframeComponent标识的收集起来
  getComponentsArr() {
   const router = this.$router;
   const routes = router.options.routes;
   const iframeArr = routes.filter(item => item.iframeComponent);
   
   return iframeArr.map((item) => {
    const name = item.name || item.path.replace('/', '');
    return {
     name: name,
     path: item.path,
     hasOpen: false, // 是否打开过，默认false
     component: item.iframeComponent // 组件文件的引用
    };
   });
  }
 }
}
</script>