var start;

 var end;

 var times = 0;

 start = new Date();//用户进入时间

 $(window).bind('beforeunload', function (e) {

     end = new Date(); //用户退出时间

     times = end.getTime() - start.getTime();

     times = Math.ceil(times / 1000); //取的是秒并且化整

     $.ajax({

         type: 'POST',

         async: false, //同步提交

         url: '/Ashx/PageRecord.ashx?action=unload',

         data: { times: times,

                 referrer: document.referrer,

                 title: document.title,

                 url: window.location.href

                 }

     });

 });