1.在idea中新建vue项目

2.main.js中修改

import Vue from 'vue'
// import Router from './Router'     /*引用自同级Router.js*/
// import Router from './SonRouter'     /*引用自同级SonRouter.js*/
// import Router from './ComponentRouter'     /*引用自同级ComponentRouter.js*/
// import Router from './UrlRouter'
import Router from './GrandSonRouter'

3.src下新建文件GrandSonRouter.js

import Vue from 'vue'
import VueRouter from 'vue-router'
Vue.use(VueRouter)

const users ={
  template:`
      <div>
            <h2>Users</h2>
            <router-view></router-view> 
       </div>
  `
}

const user ={
  template:`
      <div>
            {{$route.params.username}}-{{$route.query.id}}
       </div>
  `
}
const Home = { template:'<div><h2>Home</h2></div>'}
const about = { template:'<div><h2>about</h2></div>'}

const router = new VueRouter({
  mode:'history',
  base:__dirname, //当前的路径   dirname在node中指当前的本地路径
  routes:[       //以数组的方式给出  [{},{}],多个的话一定是routes复数形式
    {path:'/',name:'Home',component:Home},
    {path:'/',name:'about',component:about},
    {path:'/users',component:users,
      children:[
        {path:'/',name:'user',component:user},
        {path:':username',name:'user',component:user}
      ]
    }
  ]
})

new Vue({
  router,
  template:`
    <div id='r'>
        <h1>导航</h1>
         <ol>
            <li><router-link to="/">/</router-link></li>   <!--router-link存放路由链接的   to相当于href，表示链接到哪里-->
            <li><router-link to="/first">first</router-link></li>
                <ol>
                    <li><router-link :to="{path:'/users/niuningfei',query:{id:'0112309'}}">name</router-link></li>
                    <li><router-link to="about" append>append 请看地址栏</router-link></li>   <!--append属性，地址栏无限制追加to内容-->
                    <li><router-link to="about" exact>exact</router-link></li>    <!--exact必须满足to内容下要求-->
                </ol>
            <router-link tag="li" to="about">link</router-link>
          </ol>
          <router-view></router-view>   <!--规定整个路由显示在其中，class表示修饰的类-->
    </div>
    `
}).$mount('#app')

/*
name 经常和 params 联合使用 :to="{name:'Home-First-Second',params:{id:258,name:'李四'}}"   展示  {{$route.params.id}} {{$route.params.name}}
path 经常和 query 联合使用 :to="{path:'/users/niuningfei',query:{id:'0112309'}}"  展示  {{$route.query.id}}
*/

运行结果：