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   源码介绍

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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)";
    } 
})();