增加注释

src/main/java/com/uas/platform/b2c/prod/commodity/service/impl/ProductServiceImpl.java

@@ -381,7 +381,8 @@ public class ProductServiceImpl implements ProductService {
         if (productId == null) {
             return false;
         }
-        Date date = new Date(System.currentTimeMillis());
+        Date date = new Date();
+        // 删除原有的替代料数据
         List<ProductReplace> productReplacesOld = productReplaceDao.findByUserUUAndProductId(SystemSession.getUser().getUserUU(), productId);
         productReplaceDao.delete(productReplacesOld);
         for (ProductReplace productReplace : productReplaceList) {