套餐sku-list 转json字符串

@@ -219,7 +219,7 @@ exports.orderSub = (uid, addressId, cartType, deliveryTime,
     // 购买套餐商品需要的数据
     if (activityInfo) {
         params.activity_id = activityInfo.activity_id;
-        params.product_sku_list = activityInfo.product_sku_list; // TODO 检查 JSON 是否正常
+        params.product_sku_list = JSON.stringify(activityInfo.product_sku_list);
     }
 
     // 友盟有关信息的传递