{
    path: "/trafficmanagement",
    component: Layout,
    redirect: "/trafficmanagement",
    alwaysShow: true,
    meta: {
      title: "通行模块",
      icon: "excel",
    },
    children: [
        {
        path: "carline",
        name: "carline",
        alwaysShow: true,
        component: () => import("../views/trafficmanagement/carline"),
        meta: { title: "车行" },
        children: [
          {
            path: "carshopmanagement",
            component: () => import("@/views/trafficmanagement/carline/carshopmanagement"),
            name: "carshopmanagement",
            meta: { title: "车行管理", affix: true },
          },
          {
            path: "accessmanagement",
            component: () => import("@/views/trafficmanagement/carline/accessmanagement"),
            name: "accessmanagement",
            meta: { title: "进出管理", affix: true },
          },
        ],
      },
      {
        path: "peopline",
        name: "peopline",
        alwaysShow: true,
        component: () => import("../views/trafficmanagement/peopline"),
        meta: { title: "人行" },
        children: [
          {
            path: "peopconfig",
            component: () => import("@/views/trafficmanagement/peopline/peopconfig"),
            name: "peopconfig",
            meta: { title: "人行管理", affix: true },
          },
        ],
      },
    ],
  },

套了两层的children，其中在第二层套的时候，也就是车行的import 的指向是必须要有文件的，而不单单只是一个文件夹，必须要在这里再写一个出口才行。

文件截图如下：

carline文件以及peopline文件之下的index.vue内容就是又一层的路由出口

<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
export default {};
</script>

<style>
</style>