W3School TIY Editor

<!DOCTYPE html>
<html>
<script>
var H='....';
var H=H.split('');
var M='.....';
var M=M.split('');
var S='......';
var S=S.split('');
var Ypos=0;
var Xpos=0;
var Ybase=8;
var Xbase=8;
var dots=12;

function clock(){
  var time=new Date ();
  var secs=time.getSeconds();
  var sec=-1.57 + Math.PI * secs/30;
  var mins=time.getMinutes();
  var min=-1.57 + Math.PI * mins/30;
  var hr=time.getHours();
  var hrs=-1.57 + Math.PI * hr/6 + Math.PI*parseInt(time.getMinutes())/360;
  for (i=0; i < dots; ++i){
    document.getElementById("dig" + (i+1)).style.top=0-15+40*Math.sin(-0.49+dots+i/1.9).toString() + "px";
    document.getElementById("dig" + (i+1)).style.left=0-14+40*Math.cos(-0.49+dots+i/1.9).toString() + "px";
  }
  for (i=0; i < S.length; i++){
    document.getElementById("sec" + (i+1)).style.top =Ypos+i*Ybase*Math.sin(sec).toString() + "px";
    document.getElementById("sec" + (i+1)).style.left=Xpos+i*Xbase*Math.cos(sec).toString() + "px";
  }
  for (i=0; i < M.length; i++){
    document.getElementById("min" + (i+1)).style.top =Ypos+i*Ybase*Math.sin(min).toString() + "px";
    document.getElementById("min" + (i+1)).style.left=Xpos+i*Xbase*Math.cos(min).toString() + "px";
  }
  for (i=0; i < H.length; i++){
    document.getElementById("hour" + (i+1)).style.top =Ypos+i*Ybase*Math.sin(hrs).toString() + "px";
    document.getElementById("hour" + (i+1)).style.left=Xpos+i*Xbase*Math.cos(hrs).toString() + "px";
  }
  setTimeout('clock()',50);
}
window.onload=clock;
</script>
<style type="text/css">
div.dig, div.hour, div.min, div.sec
{
  position:absolute;
}
div.hour, div.min, div.sec
{
  width:2px;
  height:2px;
  font-size:2px;
}
div.dig
{
  width:30px;
  height:30px;
  font-family:arial,verdana,sans-serif;
  font-size:10px;
  color:#000000;
  text-align:center;
  padding-top:10px
}
div.min
{
  background:#0000FF;
}
div.hour
{
  background:#000000;
}
div.sec
{
  background:#FF0000;
}
</style>
<body>

<h2>JavaScript 时钟示例</h2>
<p>接下来我们要展示一个用JavaScript实现的时钟程序：</p>

<div style="width:120px;height:100px;position:relative;left:58px;top:50px;">
  <div id="dig1" class="dig">1</div>
  <div id="dig2" class="dig">2</div>
  <div id="dig3" class="dig">3</div>
  <div id="dig4" class="dig">4</div>
  <div id="dig5" class="dig">5</div>
  <div id="dig6" class="dig">6</div>
  <div id="dig7" class="dig">7</div>
  <div id="dig8" class="dig">8</div>
  <div id="dig9" class="dig">9</div>
  <div id="dig10" class="dig">10</div>
  <div id="dig11" class="dig">11</div>
  <div id="dig12" class="dig">12</div>

<div id="hour1" class="hour"></div>
  <div id="hour2" class="hour"></div>
  <div id="hour3" class="hour"></div>
  <div id="hour4" class="hour"></div>

<div id="min1" class="min"></div>
  <div id="min2" class="min"></div>
  <div id="min3" class="min"></div>
  <div id="min4" class="min"></div>
  <div id="min5" class="min"></div>

<div id="sec1" class="sec"></div>
  <div id="sec2" class="sec"></div>
  <div id="sec3" class="sec"></div>
  <div id="sec4" class="sec"></div>
  <div id="sec5" class="sec"></div>
  <div id="sec6" class="sec"></div>
</div>

</body>
</html>