Vue-router路由嵌套地址改变不跳转记录

干了一个很蠢的事，在使用ElementUI中的el-menu组件时，需要读取路由并跳转，发现嵌套路由不加载组件的问题，例如

import Vue from 'vue'
import VueRouter from 'vue-router'
import Home from '../views/Home.vue'
import Testa from '../views/Test2.vue'
import Testb from '../views/Test3.vue'
import Testc from '../views/Test4.vue'


Vue.use(VueRouter)


const routes = [
  {
    path: '/',
    name: 'Home',
    component: Home,
  },
  {
    path: '/home',
    name: 'Home',
    component: Home
  },
  {
    path: '/about',
    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: '/test',
    name: 'test',
    component: () => import('../views/Test1.vue'),
    children:[
      {path: '/test/testa', name: 'testa',component: Testa},
      {path: '/test/testb', name: 'testb',component: Testb},
      {path: '/test/testc', name: 'testc',component: Testc},
    ]
  }
]

const router = new VueRouter({
  routes
})

export default router

组件正确读取$router中的参数，并且router属性也是打开的，会正常跳转url，但是没有加载组件，发现是我没有在Test1组件中，给出路由出口<router-view/>,由此 问题解决，这可真蠢，记录一下