Inheritance: extends yii\base\Model
 public function actionCancel($id)
 {
     try {
         $cancelOrderForm = new CancelOrderForm($id);
     } catch (InvalidParamException $e) {
         throw new BadRequestHttpException($e->getMessage());
     }
     if ($cancelOrderForm->load(Yii::$app->request->post()) && $cancelOrderForm->cancel()) {
         Yii::$app->session->setFlash('success', '取消成功!');
     } else {
         Yii::$app->session->setFlash('danger', '取消失败!');
     }
     return $this->redirect(['view', 'id' => $id]);
 }