onunload关闭页面
<body onbeforeunload="Close()" 或onunload="Close()" >onbeforeunload 在 onunload 之前执行function Close()
{ 
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{ WindowClose(); } } else{ WindowClose(); } 
}