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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<p> </p>
<script>
function whichButton(event){
if(event == 65){
}
else if(event == 83){
}
else if(event == 68){
}
else if(event == 70){
}
}
</script>
</head>
<body onkeyup="whichButton(event)">
<p><b>注释：</b>在测试这个例子时，要确保右侧的框架获得了焦点。</p>
<p>在键盘上按一个键。消息框会提示出该按键的 unicode。</p>
</body>
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