优化

app-ghs/controllers/OrderItemController.php

@@ -101,7 +101,6 @@ class OrderItemController extends BaseController
             $order->packCost = $packCost;
             $order->sendCost = $sendCost;
             $order->save();
-
             if (!empty($addData)) {
                 BookItemClass::addBatchItem($addData, $order);
             }

biz-ghs/book/classes/BookItemClass.php

@@ -119,7 +119,7 @@ class BookItemClass extends BaseClass
             }
             $hasId = $bookCustomRes->id ?? 0;
             $bookCustomRes = BookCustomClass::getLockById($hasId);
-            $nowNum = bcadd($bookCustomRes->bookNum, $num);
+            $nowNum = bcsub($bookCustomRes->bookNum, $num);
             if ($nowNum < 0) {
                 util::fail($customName . '预订的' . $name . '不够减哈 bookCustom');
             }