code: public function delMember(Request $request)
      {
          $user_id = $request->param('user_id');
          if (empty($user_id)) {
              return $this->error('用户ID为空');
          }
          $user_logic = MemberLogic::instance();
          
          // 超级用户
          if ($user_logic->isAdmin($user_id)) {
              return $this->error('超级用户不能删除');
          }
          
          // 删除用户
          $user_logic->model->del($user_id);
          
          return $this->success('删除用户成功', Url::build('member/index'));
      }
docs: 删除用户
  
  @param Request $request
  @return mixed