上一节搭好了主框架，但是标签页和侧边栏只是分别展示了各自的菜单，如何将二者联动起来？
定义路由规则：当有 children 属性时，从 children 里取出 path 填充到侧边栏

1 新增组件

新增 views/dashboard/index.vue

<template>
  <div>dashboard</div>
</template>

views/article/index.vue

<template>
  <div>Article</div>
</template>

2 修改路由

修改 src/router/index.js :

import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../views/Login'
import Dashboard from '../views/dashboard'
import Article from '../views/article'
import Container from '../components/Container'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    redirect: '/dashboard',
    name: 'Container',
    component: Container,
    children: [
      {
        path: 'dashboard', 
        name: '首页', 
        component: Dashboard,
      },
      {
        path: 'article', 
        name: '文章', 
        component: Article, 
      },
    ]
  },
  {
    path: '/login',
    name: 'Login',
    component: Login
  }
]

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes
})

export default router

3 页面主框架

修改 src/components/Container.vue

<template>
  <div class="app">
    <el-container>
      <el-aside class="app-side app-side-left" :class="isCollapse ? 'app-side-collapsed' : 'app-side-expanded'">
        <div class="app-side-logo">
          <img src="@/assets/logo.png"/>
        </div>
        <div class="app-side-content">
          <el-menu :default-active="defaultActive"
                   router
                   class="el-menu-vertical-demo"
                   @open="handleOpen"
                   :collapse="isCollapse">
            <template v-for="route in routes" >
              <template v-if="route.children && route.children.length">
                <el-menu-item v-for="item in route.children"
                              :key="route.path + '/' + item.path"
                              :index="item.path"
                  >
                  <i class="el-icon-menu"></i>
                  <span slot="title">{{ item.name }}</span>
                </el-menu-item>
              </template>
            </template>
          </el-menu>
        </div>
      </el-aside>

      <el-container>
        <el-header class="app-header">
          <div class="app-side-fold"
               @click.prevent="toggleSideBar">
            <i v-show="!isCollapse" class="el-icon-s-fold"></i>
            <i v-show="isCollapse" class="el-icon-s-unfold"></i>
          </div>
          <el-menu default-active="/"
                   router
                   class="el-menu-demo tab-page"
                   mode="horizontal"
                   @select="handleSelect"
                   active-text-color="#409EFF">
            <el-menu-item index="/">首页</el-menu-item>
          </el-menu>

          <div class="app-header-userinfo">
            <el-dropdown trigger="hover"
                         :hide-on-click="false">
              <span class="el-dropdown-link">
                {{ username }}
                <i class="el-icon-caret-bottom el-icon--right"></i>
              </span>
              <el-dropdown-menu slot="dropdown">
                <el-dropdown-item>我的消息</el-dropdown-item>
                <el-dropdown-item>设置</el-dropdown-item>
                <el-dropdown-item divided
                                  @click.native="logout">退出登录</el-dropdown-item>
              </el-dropdown-menu>
            </el-dropdown>
          </div>
        </el-header>

        <el-main class="app-body">
          <template>
            <router-view/>
          </template>
        </el-main>
      </el-container>
    </el-container>
  </div>
</template>

<script>
export default {
  name: 'Container',
  data () {
    return {
      username: '',
      isCollapse: false,
    }
  },
  computed: {
    // 获取route路由
    routes () {
      return this.$router.options.routes
    } 
  },
  methods: {
    toggleSideBar () {
      this.isCollapse = !this.isCollapse
    },
    logout () {
      this.$confirm('确认退出?', '提示', {})
        .then(() => {
          sessionStorage.removeItem('user');
          this.$router.push('/login');
        })
        .catch(() => { });
    },
    handleOpen (key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose (key, keyPath) {
      console.log(key, keyPath);
    },
    handleSelect (key, keyPath) {
      console.log(key, keyPath);
    },
  },
  mounted () {
    let user = sessionStorage.getItem('user');
    if (user) {
      this.username = user;
    }
  },
}
</script>

<style lang="scss">
...

此时的页面:

2.png

3.png

文章改编自大神博客：https://www.cnblogs.com/wbjxxzx/p/9943049.html，仅作为学习实践。