vue-路由精讲 二级路由和三级路由的作用

<template>
  <div>
    <div class="row mb-5">  //row 代表行， mb-5 表示margin-bottom距离下面5
      <!-- 导航 -->
      <div class="col-4"> //四列
        <div class="list-group mb-5">
          <router-link tag="li" class="nav-link" :to="{name:'historyLink'}">
            <a class="list-group-item list-group-item-action">历史订单</a>  
          </router-link>
          <router-link tag="li" class="nav-link" :to="{name:'contactLink'}">
            <a class="list-group-item list-group-item-action">联系我们</a>  
          </router-link>
          <router-link tag="li" class="nav-link" :to="{name:'orderingGuideLink'}">
            <a class="list-group-item list-group-item-action">点餐文档</a>  
          </router-link>
          <router-link tag="li" class="nav-link" :to="{name:'deliveryLink'}">
            <a class="list-group-item list-group-item-action">快递信息</a>  
          </router-link>
        </div>
      </div>
      <!-- 导航所对应的内容 -->
      <div class="col-8"> //8列
        <router-view></router-view>
      </div>
    </div>
  </div>
</template>

import Vue from 'vue'
import VueRouter from 'vue-router'
import App from './App.vue'
import Home from './components/Home.vue'
import Menu from './components/Menu.vue'
import Admin from './components/Admin.vue'
import About from './components/about/About.vue'
import Login from './components/Login.vue'
import Register from './components/Register.vue'

//二级路由
import Contact from './components/about/Contact.vue'
import Delivery from './components/about/Delivery.vue'
import History from './components/about/History.vue'
import OrderingGuide from './components/about/OrderingGuide.vue'

//三级路由
import Phone from './components/about/contact/Phone.vue'
import PersonName from './components/about/contact/PersonName.vue'

const routes = [
  {path:'/',   name:'homeLink',  component:Home},
  {path:'/menu', name:'menuLink',  component:Menu},
  {path:'/admin', name:'adminLink', component:Admin},
  {path:'/about', name:'aboutLink', redirect:'/about/contact', component:About, children:[      
　　　　　　　　　　　　　　　　　　　　　　　//表示about页面中默认跳转到/about/contact 这个路由页面下。
    {path:'/about/contact', name:'contactLink', redirect:'/personName', component:Contact, children:[
　　　　　　　　　　　　　　　　　　　　　　　//在/about/contact页面中默认展现三级路由personName 的内容。
      {path:'/phone', name:"phoneNumber", component:Phone},
      {path:'/personName', name:"personName", component:PersonName},
    ]},
    {path:'/history',name:'historyLink',component:History},
    {path:'/delivery',name:'deliveryLink',component:Delivery},
    {path:'/orderingGuide',name:'orderingGuideLink',component:OrderingGuide},
  ]},
  {path:'/login', name:'loginLink', component:Login},
  {path:'/register', name:'registerLink', component:Register},
  // {path:'*',redirect:'/'},
]

const router = new VueRouter({
  routes,
  mode:'history'
})

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

<template>
  <div class="card text-dark bg-light mb-3">
    <div class="card-header">联系我们</div>
    <div class="card-body">
      <h4 class="card-title">联系我们</h4>
      <p class="card-text">1623487989@qq.com</p>

      <router-link :to="{name:'phoneNumber'}">电话</router-link>
      <router-link :to="{name:'personName'}">联系人</router-link>

      <router-view></router-view>
    </div>
  </div>
</template>

<template>
  <div class="card text-dark bg-light mb-3">
    <div class="card-header">快递信息</div>
    <div class="card-body">
      <h4 class="card-title">快递信息</h4>
      <p class="card-text">1623487989@qq.com</p>
    </div>
  </div>
</template>

<template>
  <div class="card text-dark bg-light mb-3">
    <div class="card-header">历史订单</div>
    <div class="card-body">
      <h4 class="card-title">历史订单</h4>
      <p class="card-text">1623487989@qq.com</p>
    </div>
  </div>
</template>

<template>
  <div class="card text-dark bg-light mb-3">
    <div class="card-header">点餐文档</div>
    <div class="card-body">
      <h4 class="card-title">点餐文档</h4>
      <p class="card-text">1623487989@qq.com</p>
    </div>
  </div>
</template>