在 /router/index.js 里配置 父子导航栏，并在子导航栏增加导出index.vue

//配置导航和页面路径

const Goods = () => import('@/pages/goods/')
const GoodsList = () => import('@/pages/goods/goodsList')
const ShopWindow = () => import('@/pages/goods/shopWindow')
const MyCart = () => import('@/pages/goods/myCart')
Vue.use(Router)


//导出
export default new Router({
  routes: [
    {
      path: '/',
      name: '首页',
      component: BasicLayout,
      children: [
        {
          path: 'goods',
          name: '商品管理',
          component: Goods,
          children: [
            {
              path: '/goodsList',
              name: '商品列表',
              component: GoodsList
            },
            {
              path: '/shopWindow',
              name: '我的橱窗',
              component: ShopWindow
            },
            {
              path: '/myCart',
              name: '直播间商品清单',
              component: MyCart
            },

          ]
        },
      ]
    },
  ]
})

index.vue

<template>
  <router-view />      
</template>
<script>
  export default {
    created () {
    }
  }
</script>
<style scoped>
</style>

项目结构：

页面效果：

搜索框样式没调成响应式的，所以错乱了。