visual-vue-v2/src/router/index.js

import Vue from 'vue'
import VueRouter from 'vue-router'
Vue.use(VueRouter)
const routes = [
  {
    path: '/',
    name: 'about',
    component: () => import('../views/01/index')
  },
  {
    path: '/01',
    name: 'about',
    component: () => import('../views/01/index')
  },
  {
    path: '/02',
    name: 'about',
    component: () => import('../views/02/index')
  },
  {
    path: '/03',
    name: 'about',
    component: () => import('../views/03/index')
  },
  {
    path: '/04',
    name: 'about',
    component: () => import('../views/04/home'),
    redirect:"/page1",
    children:[
      {
        path: '/page1',
        name: 'about',
        component: () => import('../views/04/page1'),
      },
      {
        path: '/page2',
        name: 'about',
        component: () => import('../views/04/page2'),
      },{
        path: '/page3',
        name: 'about',
        component: () => import('../views/04/page3'),
      }
    ]
  }
]

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

export default router