window.onbeforeunload=function(){
    var url = document.URL;
    var href= url.substring(url.lastIndexOf("/"),url.length);
    href=href.split("?")[0]    
    var nowTime = document.getElementById("nowTime").value;    
    var data;
            data = "nowTime="+nowTime+"&href="+href;            
     $.ajax({
            type:"POST",
            url :"server/unload.aspx",            
            data: data,
            success:function(msg){
                if(msg==1){
                var a ="";  
                }                  
            }
        })
    }