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<html>
<head>
<script type="text/javascript">
function show()
{
var time=new Date();
var hour=time.getHours();
var minute=time.getMinutes();
var second=time.getSeconds();
document.write(hour+":"+minute+":"+second);
setTimeout("show()",1000);
}
</script>
</head>
<body>
<input type="button" value="点击开始时间" onClick="show()"/>
</body>
</html>