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<html>
<head>
<script type="text/javascript">
function whichButton(event)
{
var btnNum = event.button;
if (btnNum==2)
{
alert("您點擊了滑鼠左鍵！")
}
else if(btnNum==0)
{
alert("您點擊了滑鼠右鍵！")
}
else if(btnNum==1)
{
alert("您點擊了滑鼠中鍵！");
}
else
{
alert("您點擊了" + btnNum+ "號鍵，我不能確定它的名稱。");
}
}
</script>
</head>
<body onmousedown="whichButton(event)">
<p>請在文檔中點擊滑鼠。一個訊息框會提示出您點擊了哪個滑鼠按鍵。</p>
</body>
</html>
from：http://www.w3school.com.cn/tiy/t.asp?f=hdom_event_button
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