vue2路由中router-view不显示的原因及踩坑记录

import Vue from 'vue'
import VueRouter from 'vue-router'
import Home from '@/views/home'
Vue.use(VueRouter)
const routes = [
  {
    path: '/',
    name: 'Home',
    component: Home,
    redirect: '/index',
    children: [
      {
        path: 'index',
        name: 'index',
        component: () => import('@/views/index.vue')
      }
    ]
  }
]
const router = new VueRouter({
  routes
})
export default router