public function index()
 {
     $results = ['columns' => [['名称', 'name'], ['邮箱', 'email'], ['创建时间', 'created_at'], ['操作', 'buttons', function ($data) {
         $buttons = [['编辑']];
         if (!$data->hasRole(config('defender.superuser_role', 'superuser'))) {
             array_push($buttons, ['分配角色', '#modal']);
         }
         return $buttons;
     }]]];
     $roles = Role::all();
     $paginate = Admin::orderBy('created_at', 'desc')->paginate();
     $results['items'] = $paginate;
     foreach ($paginate as $user) {
         $user['roles'] = $user->roles()->get();
     }
     return $this->view('forone::' . $this->uri . '.index', compact('results', 'roles'));
 }