js banner滚动特效

<style>
#iFocusx{position:relative; height:547px;};
.w-slider{width:100%; overflow:hidden;z-index:1;}
.pos-abs{position:absolute;}
.pos-rel{position:relative; height:547px; width:100%; overflow:hidden;}
.slider-scroll{width:100%; background:transparent;}
.slider-main{position: absolute;top: 0; left: 0;height:547px; width:4323px;}
.slider-main .current{ display:block;}
.slider-main li{width:1441px;height:547px; text-align:center; float: left; overflow:hidden;}
.slider-ctrl{ width:1441px; margin:0 auto;  text-align:center; height:35px;z-index:9999;  position: absolute;top:370px;}
.slider-ctrl .slider-ctrl-con{ display:inline-block;width:30px;height:10px;margin:0 1px;background-color: #fafafa;text-indent:-10em;overflow:hidden;cursor:pointer;border-radius:5px;-moz-box-shadow:1px 1px 1px #A9A9A9 inset;-webkit-box-shadow:1px 1px 1px #A9A9A9 inset;box-shadow:1px 1px 1px #A9A9A9 inset;background:#D3D3D3; margin-top:140px; vertical-align:top}
.slider-ctrl .current{background-color: #009896;-moz-box-shadow:1px 1px 1px #1678A0 inset;-webkit-box-shadow:1px 1px 1px #1678A0 inset;box-shadow:1px 1px 1px #1678A0 inset;}
.slider-ctrl .slider-ctrl-prev,.slider-ctrl .slider-ctrl-next{opacity:.5;position:absolute;z-index:1;overflow:hidden;width:30px;height:35px;cursor:pointer;text-indent:-10em;}
.slider-ctrl .slider-ctrl-prev:hover,.slider-ctrl .slider-ctrl-next:hover{opacity:1;}
.slider-ctrl .slider-ctrl-prev{background-position:6px top;left:0;top:0; display:none;}
.slider-ctrl .slider-ctrl-next{background-position:-6px -45px;right:0; top:-35px;}

</style>
<!--banner内容-->
<div id="iFocusx">
  <div id="js_slider" class="w-slider pos-rel">
     <ul class="slider-main">
     	<li class="slider-main-img" style="background:url(http://www.lycmd.com/uploads/allimg/141107/1-14110G620140-L.jpg) no-repeat center">
            <div class="w clearfix"> <b></b> <a href="/show/shouyehuandengpian/2014/1107/77.html" class="i_f_links track"></a> </div>
          </li>
<li class="slider-main-img" style="background:url(http://www.lycmd.com/uploads/allimg/141010/003.jpg) no-repeat center">
            <div class="w clearfix"> <b></b> <a href="/show/shouyehuandengpian/2014/1010/29.html" class="i_f_links track"></a> </div>
          </li>
<li class="slider-main-img" style="background:url(http://www.lycmd.com/uploads/allimg/141010/002.jpg) no-repeat center">
            <div class="w clearfix"> <b></b> <a href="/show/shouyehuandengpian/2014/1010/28.html" class="i_f_links track"></a> </div>
          </li>
<li class="slider-main-img" style="background:url(http://www.lycmd.com/uploads/allimg/141010/ima_29.jpg) no-repeat center">
            <div class="w clearfix"> <b></b> <a href="/show/shouyehuandengpian/2014/1010/27.html" class="i_f_links track"></a> </div>
          </li>

    </ul>
      <div class="slider-ctrl" id="slider-ctrl">
         <span class="slider-ctrl-con">1</span>
         <span class="slider-ctrl-con">2</span>
         <span class="slider-ctrl-con">3</span>
          <span class="slider-ctrl-con">4</span>
      </div>
  </div>
</div>
<script src="http://www.lycmd.com/js/jquery-1.7.1.min.js"></script>
<script>
	//当改变窗口时重新设置下盒子宽度
	var win_w = document.body.offsetWidth;
	window.onresize = function(){
		win_w = document.body.offsetWidth;
		$("#js_slider .slider-main li").width(win_w);
		$(".slider-main").width(win_w*$("#js_slider .slider-main li").length);
		rolling();
	};
	$("#js_slider .slider-main li").width(win_w);
	$(".slider-main").width(win_w*$("#js_slider .slider-main li").length);

	window.onload = rolling();
	function rolling(){
		var oDiv = document.getElementById("js_slider");
		var oUl =   oDiv.getElementsByTagName("ul")[0];
		var oLi = oUl.getElementsByTagName("li");
		var aLi = document.getElementById("slider-ctrl").getElementsByTagName("span");
		var now = 0;
		for(var i= 0; i<aLi.length;i++)
		{
			aLi[i].index = i;
			aLi[i].onmouseover = function(){
				now=this.index;
				tab();
			}
		}

		function tab(){
			for(var i= 0; i<aLi.length;i++){
				aLi[i].className ="slider-ctrl-con";
				}
				startMove(oUl, {left: -win_w*now});
				aLi[now].className+=" current";
		}

		function next()
		{
			now++
			if(now==aLi.length)
			{
				now=0;
			}
			tab();
		}
		var timer=setInterval(next, 6000);
		oDiv.onmouseover=function ()
		{
			clearInterval(timer);
		};

		oDiv.onmouseout=function ()
		{
			timer=setInterval(next, 6000);
		};
	}

	function getStyle(obj, name)
{
	if(obj.currentStyle)
	{
		return obj.currentStyle[name];
	}
	else
	{
		return getComputedStyle(obj, false)[name];
	}
}

//startMove(oDiv, {width: 400, height: 400})

function startMove(obj, json, fnEnd)
{
	clearInterval(obj.timer);
	obj.timer=setInterval(function (){
		var bStop=true;		//假设：所有值都已经到了

		for(var attr in json)
		{
			var cur=0;

			if(attr==‘opacity‘)
			{
				cur=Math.round(parseFloat(getStyle(obj, attr))*100);
			}
			else
			{
				cur=parseInt(getStyle(obj, attr));
			}

			var speed=(json[attr]-cur)/6;
			speed=speed>0?Math.ceil(speed):Math.floor(speed);

			if(cur!=json[attr])
				bStop=false;

			if(attr==‘opacity‘)
			{
				obj.style.filter=‘alpha(opacity:‘+(cur+speed)+‘)‘;
				obj.style.opacity=(cur+speed)/100;
			}
			else
			{
				obj.style[attr]=cur+speed+‘px‘;
			}
		}

		if(bStop)
		{
			clearInterval(obj.timer);

			if(fnEnd)fnEnd();
		}
	}, 30);
}
</script>