Spring Mvc Session超时easyui tab页中ajax请求跳出问题

 <!-- 
启动Spring MVC的注解功能，完成请求和注解POJO的映射，添加拦截器，类级别的处理器映射 
-->

拦截器配置

public class HandlerInterceptor1 extends HandlerInterceptorAdapter {//此处一般继承HandlerInterceptorAdapter适配器即可  
    @Override  
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {  
        if (request.getHeader("x-requested-with") != null&& request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest"))//如果是ajax请求响应头会有，x-requested-with；  </span><div style="color: rgb(153, 51, 102);"><span style="font-size:12px;">         {  </span></div><div style="color: rgb(153, 51, 102);"><span style="font-size:12px;">             response.setHeader("sessionstatus", "timeout");//在响应头设置session状态    
 response.getWriter().print("timeout"); //打印一个返回值，没这一行，在tabs页中无法跳出（<span style="font-size:12px;">导航栏能跳出</span>）
        return true;  
    }  
    @Override  
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {  
        System.out.println("===========HandlerInterceptor1 postHandle");  
    }  
    @Override  
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {  
        System.out.println("===========HandlerInterceptor1 afterCompletion");  
    }  
}  

$.ajaxSetup({ 
error: function (XMLHttpRequest, textStatus, errorThrown){
if(XMLHttpRequest.status==403){
alert('您没有权限访问此资源或进行此操作');
return false;
}
},  
         complete:function(XMLHttpRequest,textStatus){   
        var sessionstatus=XMLHttpRequest.getResponseHeader("sessionstatus"); //通过XMLHttpRequest取得响应头,sessionstatus， 
                if(sessionstatus=='timeout'){   
                      //如果超时就处理 ，指定要跳转的页面  
             var top = getTopWinow(); //获取当前页面的顶层窗口对象
             alert('登录超时, 请重新登录.'); 
                 top.location.href=path+"/login.jsp"; //跳转到登陆页面
             }   
         }   
   }); 

/** 
  * 在页面中任何嵌套层次的窗口中获取顶层窗口 
  * @return 当前页面的顶层窗口对象 
  */
function getTopWinow(){  
    var p = window;  
    while(p != p.parent){  
        p = p.parent;  
    }  
    return p;  
}