使用方法：

1、head引入css文件

<link type="text/css" href="css/style.css" rel="stylesheet" />

2、body引入HTML代碼

<div id="clock">
  <div class="hour"> 
    <div class="min"></div>
    <div class="min"></div>
    <div class="min"></div>
    <div class="min"></div>
    <div class="min"></div>
  </div>
  <div class="hour">
    <div class="min"></div>
    <div class="min"></div>
    <div class="min"></div>
    <div class="min"></div>
    <div class="min"></div>
  </div>
  <div id="alarm"> </div>
  <div id="min"></div>
  <div id="hour"></div>
  <div id="sec"></div>
  <ol>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
  </ol>
</div>

<script>
window.requestAnimFrame = (function(){
  return  window.requestAnimationFrame       ||
          window.webkitRequestAnimationFrame ||
          window.mozRequestAnimationFrame    ||
          function( callback ){
              window.setTimeout(callback, 1000 / 60);
          };
})();

//initialize the clock in a self-invoking function
(function clock(){ 
    var hour = document.getElementById("hour"),
        min = document.getElementById("min"),
        sec = document.getElementById("sec");
    //set up a loop
    (function loop(){
        requestAnimFrame(loop);
        draw();
    })();
    //position the hands
    function draw(){
        var now = new Date(),//now
            then = new Date(now.getFullYear(),now.getMonth(),now.getDate(),0,0,0),//midnight
            diffInMil = (now.getTime() - then.getTime()),// difference in milliseconds
            h = (diffInMil/(1000*60*60)),//hours
            m = (h*60),//minutes
            s = (m*60);//seconds
        //rotate the hands accordingly
        sec.style.webkitTransform = "rotate(" + (s * 6) + "deg)";
        hour.style.webkitTransform = "rotate(" + (h * 30 + (h / 2)) + "deg)";
        min.style.webkitTransform = "rotate(" + (m * 6) + "deg)";
    } 
})();</script>