/**
  * 动作:后台执行登录
  *
  * @param Request $request
  * @return \Illuminate\Http\RedirectResponse
  */
 public function postLogin(Request $request)
 {
     if (Auth::attempt(['username' => $request->get('username'), 'password' => $request->get('password')])) {
         return responseSuccess('登录成功', 'admin');
     }
     return responseFail('用户名或密码错误');
 }
 /**
  * 删除
  *
  * @param ineger $id 公众号iD
  */
 public function getDestroy($id)
 {
     $role = $this->roleRepository->getById($id);
     if ($role->user) {
         return responseFail('该角色下存在用户不能删除');
     }
     $this->roleRepository->destroy($id);
     return responseSuccess('删除成功');
 }