<html>
<head>
<script type="text/javascript">
function whichButton(event)
{
var btnNum = event.button;
if (btnNum==2)
alert("您点击了鼠标右键！")
}
else if(btnNum==0)
alert("您点击了鼠标左键！")
else if(btnNum==1)
alert("您点击了鼠标中键！");
else
alert("您点击了" + btnNum+ "号键，我不能确定它的名称。");
</script>