vue-router 子路由时，父级component设置

component使用对象形式，使用render函数进行处理

{
  path: '/system',
  name: 'System',
  meta: {
    title: '系统设置',
    icon: 'el-icon-setting'
  },
  component: {
    render(h: CreateElement) {
      return h('router-view')
    }
  },
  children: [
    {
      path: 'permission',
      name: 'Permission',
      meta: {
        title: '权限设置',
        icon: 'el-icon-set-up'
      },
      component: () => import('@/views/system/Permission.vue'),
    },
  ]
}