ajax无参数刷新页面

  <c:set var="ctx" value="${pageContext.request.contextPath}"/> 

  <input type="hidden" name="appPath_" value="${ctx}" />

  function refreshLbye()
  {
         var appPath_ = $("#appPath_").val();
         $.ajax({
                 type: "POST",
                 url: appPath_+"/ajax/refreshLbye.xhtml",
                 data: null,
                 success: function(data)
                 {
                       $("#login").load(appPath_+"/page/login.jsp?random="+Math.random());
                 }
         });
   }