增加判断

@@ -32,7 +32,7 @@ var thumbsLoaded = {};
 
 var $main = $('.main'),
     id = $main.data('id'),
-    isTicket = $('input[name="isTicket"]').length > 0 && $('input[name="isTicket"]').val() === true;
+    isTicket = $('input[name="isTicket"]').length > 0 && $('input[name="isTicket"]').val() === 'true';
 
 var maxStock = -1; // 记录当前选中的颜色-尺码的库存量，若为-1，代表未选择尺码