自己写的AjaxForm

$.AjaxForm('<%=Url.Content("~/Utility/PicUploadHander.ashx")%>', 'UpLoadForm', function (str) {
                var json = eval('(' + str + ')');
                alert(json.Name);
                parent.Home();//主页面的方法
            }); 

 private void WriteForm(string str, HttpContext context)
        {
            string method = context.Request["callbackmethod"];
            string isJson = context.Request["isJson"];
            string hs = "<script> void " + method + " ('" + str + "');</script>";
            context.Response.Write(hs);
            context.Response.Flush();
            context.Response.Close();
        }