<html>
<head>
<script type="text/javascript">
function whichButton(event)
{
var btnNum = event.button;
if (btnNum==2)
{
alert("您點選了滑鼠左鍵！")
}
else if(btnNum==0)
alert("您點選了滑鼠右鍵！")
else if(btnNum==1)
alert("您點選了滑鼠中鍵！");
else
alert("您點選了" + btnNum+ "号鍵，我不能确定它的名稱。");
}
</script>
</head>
<body onmousedown="whichButton(event)">
<p>請在文檔中點選滑鼠。一個消息框會提示出您點選了哪個滑鼠按鍵。</p>
</body>
</html>
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