<script language="javascript" type="text/javascript"> 
   window.onbeforeunload=function window.onbeforeunload()
    { 
if (event.clientX>document.body.clientWidth && event.clientY<0||event.altKey) 
{ 
window.event.returnValue="确认结束当前会话？";   
}    
} 
</script>

------解决方案--------------------

前台JS方法
JScript code

<script language="javascrip" type="text/javascript"> 
 function load()   
  { 
   var ua = navigator.userAgent;
   var ie = navigator.appName == "Microsoft Internet Explorer" ? true:false;
   if (ie) 
   { 
    var IEversion=parseFloat(ua.substring(ua.indexOf("MSIE ")+5,ua.indexOf(";",ua.indexOf("MSIE "))));
    if (IEversion< 5.5) 
    { 
      var str  = '<object id=noTipClose classid="clsid:ADB880A6-D8FF-11CF-9377-00AA003B7A11">'; 
      str += '<param name="Command" value="Close"></object>'; 
      document.body.insertAdjacentHTML("beforeEnd", str); 
      document.all.noTipClose.Click();
    } 
    else 
    { 
   
     var butten1= document.getElementById("Button1");
     butten1.click(); 
     alert("已退出系统");//此句必须要 不然关闭时间太短也不起作用（我还没有想到好的方法解决）
     window.opener = null;   
     window.close(); 
    }
   } 
   else 
   { 
    window.close();
   } 
  }
</script>

------解决方案--------------------

<script type="text/javascript">  
<!--  
   function getBO()  
   {  
     ret = confirm("你是否要关闭窗口");  
     if(ret)  
     {  
         external.addFavorite('网址','收藏名称') ;
        window.close();  
      }  
  
}
</script>