<"remember me" session.
   *
   * @return string
   */
  public function getRememberToken()
  {
    return $this->{$this->getRememberTokenName()};
  }

  /**
   * Set the token value for the "remember me" session.
   *
   * @param string $value
   * @return void
   */
  public function setRememberToken($value)
  {
    $this->{$this->getRememberTokenName()} = $value;
  }

  /**
   * Get the column name for the "remember me" token.
   *
   * @return string
   */
  public function getRememberTokenName()
  {
    return 'remember_token';
  }
}

'model' => App\Models\User::class,    //指定模型
'table' => 'user',                   //指定用户表(user是我数据中储存用户的表)

public function store(Request $request)
  {

    if(empty($request->get('chkCode')) || trim($request->get('chkCode')) != trim(Session::get('admincaptcha'))){

      $error->add('result','验证码不正确');

      return back()->withErrors($error);
    }
    $adminUser = User::where('user_name',$request->get('user_name'))->where('user_role_id', '>', 0)->first();

    if(empty($adminUser)){

      $error->add('result','用户无后台权限');

      return back()->withErrors($error);
    }else{

      if (md5($request->get('user_pwd'))===$adminUser->password&&$adminUser->user_role_id){

        Auth::login($adminUser);

        Session::put('admincaptcha', "");

        return redirect()->route('admin.home');

      }else{

        $error->add('result','用户名或密码错误');

        return back()->withErrors($error);
      }
    }
  }