一些功能

app/models/system/SystemStore.php

@@ -231,6 +231,7 @@ class SystemStore extends BaseModel
 //            var_dump($product);
 //            exit;
             $cartNum = $product['cart_num'] ?? 0;
+            if ($product['exchange_id']) $cartNum = 1;
             if (isset($product['productInfo'])) {
                 $stock = SystemStoreProductStock::where(['product_id' => $product['product_id'], 'unique' => $product['product_attr_unique'], 'store_id' => $orderInfo['store_id']])->find();
                 $res = $res && SystemStoreProductStockLog::expend($orderInfo['store_id'], $product['product_id'], $product['product_attr_unique'], 'sale', $orderInfo['id'], $cartNum, 0, '用户' . $userInfo['nickname'] . '购买订单完成', 1, $stock ? $stock['price'] : 0);