问题: 默认情况下,一级导航下面只有1个二级导航的时候, 一级导航会不做显示, 仅展示二级导航.

需求: 一级导航和二级导航都展示, 如下面右图

仅需要在路由写上这行就行 

alwaysShow: true,

// 全部是这样
{
    path: "/management",
    component: Layout,
    redirect: "/management/toPayOrder",
    name: "OrderManagement",
    alwaysShow: true, // 就是这行显隐起作用的
    meta: {
      title: "管理",
      icon: "el-icon-s-grid"
    },
    children: [
      {
        path: "toPayOrder",
        name: "ToPayOrder",
        component: () => import("@/views/management/toPayOrder"),
        meta: {
          title: "财务订单",
          icon: "el-icon-menu"
        },
        hidden: false
      },
      {
        path: "toPayOrderDetail",
        name: "ToPayOrderDetail",
        component: () =>
          import("@/views/management/detail/orderDetail"),
        meta: {
          title: "详情"
        },
        hidden: true
      }
    ]
  },