直接通过案例的形式来演示多级路由的用法

1. 文件结构
   

2. Banner.vue

   <template>
       <div class="col-xs-offset-2 col-xs-8">
           <div class="page-header"><h2>Vue Router Demo</h2></div>
       </div>
   </template>
   
   <script>
   export default {
       name:'Banner'
   }
   </script>
   
   <style>
   
   </style>
   

3. About.vue

   <template>
      <h2>我是About的内容</h2>
   </template>
   
   <script>
   export default {
       name:'About',
       mounted() {
           console.log(this)
       },
   }
   </script>
   

4. Home.vue

   <template>
       <div>
           <h2>Home组件内容</h2>
           <div>
               <ul class="nav nav-tabs">
                   <li>
                   <router-link class="list-group-item" active-class="active" to="/home/news">News</router-link>
                   </li>
                   <li>
                   <router-link class="list-group-item" active-class="active" to="/home/message">Message</router-link>
                   </li>
               </ul>
               <router-view></router-view>
           </div>
       </div>
   </template>
   
   <script>
   export default {
       name:'Home',
       mounted() {
           console.log(this)
       },
   }
   </script>
   
   

5. Message.vue

   <template>
     <div>
       <ul>
           <li>
               <a href="/message1">message001</a>&nbsp;&nbsp;
           </li>
           <li>
               <a href="/message2">message002</a>&nbsp;&nbsp;
           </li>
           <li>
               <a href="/message/3">message003</a>&nbsp;&nbsp;
           </li>
       </ul>
       </div>
   </template>
   
   <script>
   export default {
       name:'Message'
   }
   </script>
   
   

6. News.vue

   <template>
       <ul>
           <li>news001</li>
           <li>news002</li>
           <li>news003</li>
       </ul>
   </template>
   
   <script>
   export default {
       name:'News'
   }
   </script>
   
   

7. router->index.js

   //该文件专门用于创建整个应用的路由器
   import VueRouter from "vue-router";
   //引入组件
   import About from '../pages/About'
   import Home from '../pages/Home'
   import Message from '../pages/Message'
   import News from '../pages/News'
   //创建并暴露一个路由器
   export default new VueRouter({
       routes:[
           {
               path:'/about',
               component:About
           },
           //一级路由
           {
               path:'/home',
               component:Home,
               //二级路由（子路由）
               children:[
                   {
                       path:'news',
                       component:News
                   },
                   {
                       path:'message',
                       component:Message
                   }
               ]
           }
   
       ]
   })
   

8. App.vue

   <template>
   <div>
       <div class="row">
         <Banner/>
       </div>
       <div class="row">
         <div class="col-xs-2 col-xs-offset-2">
           <div class="list-group">
             <!-- 原始html我们使用a标签实现页面的跳转 -->
             <!-- <a class="list-group-item" href="./about.html">About</a>
             <a class="list-group-item active" href="./home.html">Home</a> -->
             <!-- Vue中使用router-link标签实现路由的切换 -->
             <router-link class="list-group-item" active-class="active" to="/about">About</router-link>
             <router-link class="list-group-item" active-class="active" to="/home">Home</router-link>
           </div>
         </div>
         <div class="col-xs-6">
           <div class="panel">
             <div class="panel-body">
               <!-- 指定组件的呈现位置 -->
              <router-view></router-view>
             </div>
           </div>
         </div>
       </div>
     </div>
   </template>
   
   <script>
   import Banner from './components/Banner.vue';
   export default {
       name:"App",
       components:{Banner}
   }
   </script>
   
   

9. main.js

   import Vue from "vue"
   import App from "./App.vue"
   //引入Vue-router路由器插件
   import VueRouter from "vue-router";
   //引入路由器
   import router from "./router/index";
   //应用插件
   Vue.use(VueRouter)
   Vue.config.productionTip=false;
   const vm = new Vue({
       el:"#app",
       render:h=>h(App),
       router:router
   
   })
   // console.log(vm)