Vue implements nested routing method example

<template>
  <h1>Xianyu_Turnover1</h1>
</template>
<script>
  export default {
    name: "UserList"
  }
</script>
<style scoped>
</style>

<template>
  <h1>Xianyu_turnaround2</h1>
</template>
<script>
  export default {
    name: "UserList"
  }
</script>
<style scoped>
</style>

<template>
    <div>
      <el-container>
        <el-aside width="200px">
          <el-menu :default-openeds="['1']">
            <el-submenu index="1">
              <template slot="title"><i class="el-icon-caret-right"></i>User Management</template>
              <el-menu-item-group>
                <el-menu-item index="1-1">
                <!--Where to insert-->
                  <router-link to="/user/profile">Personal Information</router-link>
                </el-menu-item>
                <el-menu-item index="1-2">
                <!--Where to insert-->
                  <router-link to="/user/list">User list</router-link>
                </el-menu-item>
              </el-menu-item-group>
            </el-submenu>
            <el-submenu index="2">
              <template slot="title"><i class="el-icon-caret-right"></i>Content Management</template>
              <el-menu-item-group>
                <el-menu-item index="2-1">Category Management</el-menu-item>
                <el-menu-item index="2-2">Content List</el-menu-item>
              </el-menu-item-group>
            </el-submenu>
          </el-menu>
        </el-aside>

        <el-container>
          <el-header style="text-align: right; font-size: 12px">
            <el-dropdown>
              <i class="el-icon-setting" style="margin-right: 15px"></i>
              <el-dropdown-menu slot="dropdown">
                <el-dropdown-item>Personal Information</el-dropdown-item>
                <el-dropdown-item>Log out</el-dropdown-item>
              </el-dropdown-menu>
            </el-dropdown>
          </el-header>
          <el-main>
          <!--Show the view here-->
            <router-view />
          </el-main>
        </el-container>
      </el-container>
    </div>
</template>
<script>
    export default {
        name: "Main"
    }
</script>
<style scoped lang="scss">
  .el-header {
    background-color: #B3C0D1;
    color: #333;
    line-height: 60px;
  }
  .el-aside {
    color: #333;
  }
</style>

//Import vue
import Vue from 'vue';
import VueRouter from 'vue-router';
//Import componentsimport Main from "../views/Main";
import Login from "../views/Login";
//Import submoduleimport UserList from "../views/user/List";
import UserProfile from "../views/user/Profile";

//Use Vue.use(VueRouter);
//Export export default new VueRouter({
  routes: [
    {
      //Login page path: '/main',
      component: Main,
      // Write to submodule children: [
        {
          path: '/user/profile',
          component: UserProfile,
        }, {
          path: '/user/list',
          component: UserList,
        },
      ]
    },
    //front page{
      path: '/login',
      component: Login

    },
  ]
})

          <el-submenu index="3">
            <template slot="title"><i class="el-icon-caret-right"></i>Xianyu_turnaround management</template>
            <el-menu-item-group>
              <el-menu-item index="3-1">Xianyu_Fanshe 4</el-menu-item>
              <el-menu-item index="3-2">Xianyu_Fanshe5</el-menu-item>
            </el-menu-item-group>
          </el-submenu>