public function login()
    {

        $phone = $this->request->post('phone');
        $password = $this->request->post('password');

        $user = $this->model->where('mobile', $phone)->find();
        if (empty($user)) {
            $this->error('该用户不存在');
        }
        if (md5($password + $user->salt) == $user->login_pwd) {
            session('userInfo', $user);
            $this->success('登录成功');
        } else {
            $this->error('密码错误');
        }
    }


    protected function saveFilter(&$row)
    {
        $row['nickname'] = '用户:' . $row['mobile'];
        $row['salt'] = rand(1000, 9999);
        if (isset($row['login_pwd']) && !empty($row['login_pwd'])) {
            $row['login_pwd'] = md5(md5($row['login_pwd']) + $row['salt']);
        }
        if (isset($row['trade_pwd']) && !empty($row['trade_pwd'])) {
            $row['trade_pwd'] = md5(md5($row['trade_pwd']) + $row['trade_pwd']);
        }
    }