1.在router下的index中添加以下代码

import Welcome from '@/components/Welcome'

{
  path: '/home',
  name: 'home',
  component: Home,
  // 重定向到welcome
  redirect: '/welcome',
  // 添加子路由
  children: [
    {
      path: '/welcome',
      name: 'welcome',
      component: Welcome
    }
  ]
}

2.在主路由的vue中添加路由占位符

<el-main>
  <!--路由占位符-->
  <router-view></router-view>
</el-main>