ie9中方法$ .ajax成功未收到数据

In ie9 the success method receives only by two parameters: textStatus and XMLHttpRequest. Data is always undefined. In all the other the other browsers the code works properly and all the 3 parameters are sent to success method. As a result I cannot process any of the ajax-requests after it is done. What can be the reason for it?In ie9 the success method receives only by two