`

js显示一个时钟

 
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
<script type="text/javascript">
function startTime(){
 var today = new Date();
 var H = checkTime(today.getHours());
 var M = checkTime(today.getMinutes());
 var S = checkTime(today.getSeconds());
 document.getElementById('txt').innerHTML = H+':'+M+':'+S;
 setTimeout('startTime()',500)
}

function checkTime(i){
 if(i<10){
  return "0"+i;
 }else{
  return i;
 }
}
</script>
</head>
<body onload="startTime()"> 
<div id="txt"></div>
</body>
</html>

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