[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = true)]

         public class CustomAuthAttribute : ActionFilterAttribute, IAuthorizationFilter

         {

             public void OnAuthorization(AuthorizationContext filterContext)

             {

                 if (!filterContext.ActionDescriptor.IsDefined(typeof(AllowAnonymousAttribute), true)

                             && !filterContext.ActionDescriptor.ControllerDescriptor.IsDefined(typeof(AllowAnonymousAttribute), true))

                 {

                     UserInfo user = filterContext.HttpContext.Session["CurentUser"] as UserInfo;

                     if (user == null || user.Id <= )

                     {

                         if (filterContext.HttpContext.Request.IsAjaxRequest())

                         {

                             filterContext.Result = new HttpStatusCodeResult();

                             filterContext.HttpContext.Response.Write("/Home/Login");

                             return;

                         }

                         else

                         {

                             filterContext.Result = new RedirectResult("/Home/Login");

                             return;

                         }

                     }

                 }

             }

         }

 <script type="text/javascript">

     (function ($) {

         //备份jquery的ajax方法

         var _ajax = $.ajax;

         //重写jquery的ajax方法

         $.ajax = function (opt) {

             //备份opt中error和success方法

             var fn = {

                 error: function (XMLHttpRequest, textStatus, errorThrown) { },

             }

             if (opt.error) {

                 fn.error = opt.error;

             }

             //扩展增强处理

             var _opt = $.extend(opt, {

                 error: function (XMLHttpRequest, textStatus, errorThrown) {

                     //错误方法增强处理

                     if (XMLHttpRequest.status == "") {

                         window.location.href = "/FlexibleBenefit/Login";

                     }

                     else

                     {

                         fn.error(XMLHttpRequest, textStatus, errorThrown);

                     }

                 }

             });

             _ajax(_opt);

         };

     })(jQuery);

     $.ajaxSetup({

         statusCode: {

             : function (data) {

                 window.location.href = data.responseText;

             }

         }

     });

 </script>