火狐狸浏览器中教本问题。

<html>
 <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<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ns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>
//Javascript Document.
<hr>
<center>
<h3>请按任意一个键。</h3>
</center>
</body>
</html>