//封装前public function del($id){if(empty($id)){      return $this->error('非法操作！');    }    $map['id'] = array('IN' , $id);    $result = db('table')->where($map)->delete();    if( $result ) {      return $this->success('删除成功');    }    else {      return $this->error('删除失败');    }}//封装后BaseModelclass Base extends \think\Model{  protected $param;  protected $type = array(    'id'       => 'integer' ,    'cover_id' => 'integer' ,  );  public function initialize()  {    parent::initialize();    $this->param = \think\Request::instance()->param();  }  /**   * 数据修改   * @return [bool] [是否成功]   */  public function change()  {    $data = \think\Request::instance()->post();    if( isset($data['id']) && $data['id'] ) {      return $this->save($data , array('id' => $data['id']));    }    else {      return $this->save($data);    }  }}