利用限购码多次下单商品时不跳转到错误页，改成在限购商品详情页刷新

@@ -307,8 +307,13 @@ class IndexController extends AbstractAction
             $this->go($order['cartUrl']);
         }
         if (isset($order['error'])) { // 限购商品支付接口返回为空或错误时
+            if ($this->isAjax()) {
+                $this->echoJson($order);
+                return;
+            } else {
                 $this->error();
             }
+        }
 
         $data = array(
             'orderEnsurePage' => true,