此博客展示了一段JavaScript代码，用于检测在不同浏览器（NS和IE）中按下按键的情况。代码通过判断浏览器类型，获取按键的键值，并将NS和IE浏览器中的键值及实际按键信息通过弹窗显示出来。
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
<html>
<!--//this code by hongseheike-->
<head>
<script language="javascript">
ns4 = (document.layers) ? true : false;
ie4 = (document.all) ? true : false;
function keyDown(e){
if(ns4){
var nkey=e.which;
var iekey='现在是ns浏览器';
var realkey=String.fromCharCode(e.which);
}
if(ie4){
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;
if(ns4){
document.captureEvents(Event.KEYDOWN);}
</script>
</head>
<body>
//Javascript Document
<hr>
<center>
<h3>请按任意一个键。。。。</h3>
</center>
</body>
</html>
<html>
<!--//this code by hongseheike-->
<head>
<script language="javascript">
ns4 = (document.layers) ? true : false;
ie4 = (document.all) ? true : false;
function keyDown(e){
if(ns4){
var nkey=e.which;
var iekey='现在是ns浏览器';
var realkey=String.fromCharCode(e.which);
}
if(ie4){
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;
if(ns4){
document.captureEvents(Event.KEYDOWN);}
</script>
</head>
<body>
//Javascript Document
<hr>
<center>
<h3>请按任意一个键。。。。</h3>
</center>
</body>
</html>
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