解决vue-element-admin三级菜单显示

二级component修改：component: { render(c) { return c('router-view') } },

{
    path: '/testDetectionMobile',
    component: Layout,
    redirect: '/testDetectionDashboard/index', // 用于面包屑跳转
    // alwaysShow: true, // will always show the root menu
    name: 'testDetectionMobile',
    meta: {
      title: 'testDetection',
      icon: 'reportFirst'
    },
    children: [
      {
        path: 'sampleId',
        component: () => import('@/views/testDetectionMobile/sampleId/sampleId_index'),
        name: 'sampleIdMobile',
        meta: { title: 'sampleId', icon: 'report', affix: true }
      },
      {
        path: 'myTestData/myTestDataTable',
        component: () => import('@/views/testDetectionMobile/myTestData/myTestData_index'),
        name: 'myTestDataTableMobile',
        meta: { title: 'myTestData', icon: 'report', affix: true },
      },
      {
        path: 'myTestData/dataSource',
        component: () => import('@/views/testDetectionMobile/myTestData/dataSource_index'),
        name: 'dataSourceMobile',
        meta: { title: 'dataSource', icon: 'report', affix: true },
        hidden: true
      },
      {
        path: 'myTestData/myTestDataModify',
        component: () => import('@/views/testDetectionMobile/myTestData/myTestDataModify_index'),
        name: 'myTestDataModify',
        meta: { title: 'myTestDataModify', icon: 'report', affix: true },
        hidden: true
      },
      {
        path: 'steelNky',
        component: () => import('@/views/testDetection/steelNky/steelNky_index'),
        name: 'steelNkyMobile',
        meta: { title: 'steelNky', icon: 'report', affix: true }
      },

      {
        path: '/dataUpdate',
        component: { render(c) { return c('router-view') } },
        redirect: '/dataUpdate/offlineDataUpload', // 用于面包屑跳转
        // alwaysShow: true, // will always show the root menu
        name: 'dataUpdate',
        meta: {
          title: 'dataUpdate',
          icon: 'report',
          roles: ['DataUpload', 'SystemAdmin']
        },
        children: [
          {
            path: 'offlineDataUpload',
            component: () => import('@/views/dataUpdate/offlineDataUpload/offlineDataUpload_index'),
            name: 'offlineDataUpload',
            meta: {
              title: 'offlineDataUpload',
              icon: 'rightarrow',
              affix: true,
              roles: ['DataUpload', 'SystemAdmin']
            }
          },
          {
            path: 'myUploadDataMobile',
            component: () => import('@/views/dataUpdate/myUploadData/myUploadDataMobile_index'),
            name: 'myUploadDataMobile',
            meta: {
              title: 'myUploadData',
              icon: 'rightarrow',
              affix: true,
              roles: ['DataUpload', 'SystemAdmin']
            }
          }
        ]
      },
    ]
  },