获取键盘代码

<html>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <head>
        <script language="javascript">
            var ie = navigator.appName == "Microsoft Internet Explorer" ? true : false;
            
            function keyDown(e){
                if (!ie) {
                    var nkey = e.which;
                    var iekey = '现在是非ie浏览器';
                    var realkey = String.fromCharCode(e.which);
                }
                if (ie) {
                    var iekey = event.keyCode;
                    var nkey = '现在是ie浏览器';
                    var realkey = String.fromCharCode(event.keyCode);
                    if (event.keyCode == 32) {
                        realkey = '\' 空格\''
                    }
                    if (event.keyCode == 13) {
                        realkey = '\' 回车\''
                    }
                    if (event.keyCode == 27) {
                        realkey = '\' Esc\''
                    }
                    if (event.keyCode == 16) {
                        realkey = '\' Shift\''
                    }
                    if (event.keyCode == 17) {
                        realkey = '\' Ctrl\''
                    }
                    if (event.keyCode == 18) {
                        realkey = '\' Alt\''
                    }
                }
                alert('ns浏览器中键值:' + nkey + '\n' + 'ie浏览器中键值:' + iekey + '\n' + '实际键为' + realkey);
            }
            
            document.onkeydown = keyDown;
        </script>
    </head>
    <body>
        <center>
            <h3>请按任意一个键。。。。</h3>
        </center>
    </body>
</html>

来自于：http://blog.sina.com.cn/s/blog_53c81e5901000b2y.html