纯JavaScript与CSS实现竖排弹性动画菜单

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>竖排黑色动画菜单</title>
<style type="text/css">
#menu {
 height: auto;
 width: 350px;
 float: left;
}
body {
 overflow: auto;
 background: #333;
 color: #FFF;
 font: 12px Arial, Helvetica, sans-serif;
}
#menu li {
 display: block;
 list-style-type: none;
}
#menu a {
 font-size: 11px;
 color: #FFF;
 padding-right: 10px;
 padding-left: 10px;
 line-height: 30px;
 text-decoration: none;
 background: #000 url(images/bg.jpg) no-repeat left;
 height: 30px;
 width: 180px;
 display: block;
 outline:0;
 margin-bottom: 5px;
}
#menu a:hover {
 color: #CCFF00;
 background: #000 url(images/bg1.jpg) no-repeat left;
}
</style>
</head>
<body>
 <div id="menu">
 <ul>
  <li><a href="#" title="" class="toggler">JQuery插件</a></li>
  <li><a href="#" class="toggler">Ext 皮肤</a></li>
  <li><a href="#" class="toggler">CSS特效</a></li>
  <li><a href="#">Ajax技巧集</a></li>
 </ul>
 </div>
<script type="text/javascript">
var $ = function(_sId){return typeof _sId == 'string' ? document.getElementById(_sId) : _sId;}
var Each=function (a,fn){for(var i=0;i<a.length;i++)fn.call(a[i],i,a)};
var Tweener = {
  easeNone: function(t, b, c, d) {
    return c*t/d + b;
  },
  easeOutBounce: function(t, b, c, d) {
    if((t/=d) <(1/2.75)) {
      return c*(7.5625*t*t) + b;
    } else if(t <(2/2.75)) {
      return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
    } else if(t <(2.5/2.75)) {
      return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
    } else {
      return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
    }
  }
};
Each($('menu').getElementsByTagName('a'), function(){
 this.onmouseover = function(){
  var b = parseInt(this.style.marginLeft);
  b = isNaN(b) ? 0 : b;
  var t=0,c=30-b,d =10,ttl=10;
  var me = this;
  clearInterval(me.only);
  me.only=setInterval(function (){
  me.style.marginLeft = Tweener.easeNone(t,b,c,d)+'px';
  if(t<d) t++;
  else{
   clearInterval(me.only);
  }
  },ttl)
 }
 this.onmouseout = function(){
  var b = parseInt(this.style.marginLeft);
  b = isNaN(b) ? 0 : b;
  var t=0,c=0-b,d =50,ttl=10;
  var me = this;
  clearInterval(me.only);
  me.only=setInterval(function (){
  me.style.marginLeft = Tweener.easeOutBounce(t,b,c,d)+'px';
  if(t<d) t++;
  else{
   clearInterval(me.only);
  }
  },ttl)
 }
 }
);
</script>
</body>
</html>