diff --git a/exchange.html b/exchange.html
index f568888..32c9cba 100644
--- a/exchange.html
+++ b/exchange.html
@@ -261,6 +261,7 @@
           return;
         }
 
+        /* 当只有一个卡密商品、为线上查看卡密且只能兑换一次时执行 */
         if (this.goodInfo.product_type === 2 && this.goodInfo.card_show == 2 && !this.backAble && this.goodsDetail.restrict == 1) {
           return this.surexchangeBtn();
         }