修改商品详情页脚本bug

@@ -88,8 +88,8 @@ function render(data) {
         $('.btn-minus,.btn-plus').find('span').addClass('disabled');
     }
     $('#limitNum').val(data.limit);
-    $('#promotionId').val(promotionId);
-    $('#single').val(single);
+    $('#promotionId').val(data.cartInfo.promotionId);
+    $('#single').val(data.single);
     $('#chose-btn-sure').text(data.tickets ? '立即购买' : '加入购物车')
 
 }