NavMenu navigation menu

First introduce element related code

    <el-menu
     :default-active="$route.path"
     router
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose">
      <el-submenu index="1">
        <template slot="title">
          <i class="el-icon-location"></i>
          <span>导航一</span>
        </template>
        <el-menu-item-group>
          <template slot="title">分组一</template>
          <el-menu-item index="/src/views/Demo.vue">选项1</el-menu-item>
          <el-menu-item index="/src/views/About.vue">选项2</el-menu-item>
        </el-menu-item-group>
      </el-submenu>
    </el-menu>

Then configure routing

  {
    
    
    path: '/',
    name: 'Home',
    component: Home,
    children:[
      {
    
    
        path: '/src/views/About.vue',
        name: 'About',
        // route level code-splitting
        // this generates a separate chunk (about.[hash].js) for this route
        // which is lazy-loaded when the route is visited.
        component: () => import(/* webpackChunkName: "about" */ '@/views/About.vue')
      },
      {
    
    
        path: '/src/views/Demo.vue',
        name: 'Demo',
        // route level code-splitting
        // this generates a separate chunk (about.[hash].js) for this route
        // which is lazy-loaded when the route is visited.
        component: () => import(/* webpackChunkName: "about" */ '@/views/Demo.vue')
      }
    ]
  },

Then click to appear vue corresponding attribute by index
then you need to write <router-view><router-view/>a placeholder corresponding to the contents to appear vue

Overall code

    <el-col :span="22">
    <el-menu
     :default-active="$route.path"
     router
      class="el-menu-vertical-demo"
      @open="handleOpen"
      @close="handleClose">
      <el-submenu index="1">
        <template slot="title">
          <i class="el-icon-location"></i>
          <span>导航一</span>
        </template>
        <el-menu-item-group>
          <template slot="title">分组一</template>
          <el-menu-item index="/src/views/Demo.vue">选项1</el-menu-item>
          <el-menu-item index="/src/views/About.vue">选项2</el-menu-item>
        </el-menu-item-group>
      </el-submenu>
    </el-menu>
  </el-col>
    <router-view></router-view>