JS监听浏览器封闭当前窗口 _JavaScript

JS监听浏览器关闭当前窗口
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head>

<body>
<script type="text/javascript">
window.onbeforeunload = onbeforeunload_handler;
    window.onunload = onunload_handler;
    function onbeforeunload_handler(){
        var warning="确认关闭当前窗口吗？";
        //你的业务操作。。。。
        return warning;
    }

    function onunload_handler(){
        var warning="谢谢光临";
        //你的业务操作。。。。
        alert(warning);
    }
</script>
</body>
</html>