<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function testtime(){
var d=new Date();
var hour=d.getHours();
if(hour<10){
hour="0"+hour;
}
var minute=d.getMinutes();
if(minute<10){
minute="0"+minute;
}
var second=d.getSeconds();
if(second<10){
second="0"+second;
}
<!--关键语句-->
document.getElementById("display").innerHTML=hour+":"+minute+":"+second;
}
var t=window.setInterval("testtime()",1000);
</script>
</head>
<body>
<!--显示地方-->
<div id="display"></div>
</body>
</html>
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