无缝滚动

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>轮播图-无缝滚动</title>
<style>
body,ul,ol{margin:0;padding:0;}
li{ list-style:none;}
img{ border:none; vertical-align:top; }
#box{width:470px;height:150px; position:relative; margin:30px auto; overflow:hidden;}
ul{ width:470px; position:absolute;left:0; top:0; z-index:1;}
ul li{width:470px;height: 270px }
ol{z-index:2; width:120px; position:absolute;right:10px; bottom:10px;}
ol li{ width:20px;height:20px; float:left;margin:0 2px; display:inline; background:#fff; color:#f60; line-height:20px; text-align:center;}
ol .active{ background:#f60; color:#fff;}
</style>
<script src="js/move.js"></script>
</head>
<body>
<div id="box">
    <ul>
    <li style="display:block"><img src="images/1.jpg" alt=""/></li>
<li><img src="images/2.jpg" alt=""/></li>
<li><img src="images/3.jpg" alt=""/></li>
<li><img src="images/4.jpg" alt=""/></li>
<li><img src="images/5.jpg" alt=""/></li>
</ul>
<ol>
    <li class="active">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ol>
</div>
<script>
var oBox=document.getElementById("box");
    var oUl = document.getElementsByTagName('ul')[0];
    var aLiUl = oUl.getElementsByTagName('li');
    var oOl = document.getElementsByTagName('ol')[0];
var aLiOl = oOl.getElementsByTagName('li');
var timer=null;
var iNow=0;
var iNow2=0;
for(var i=0;i<aLiOl.length;i++){
aLiOl[i].index=i;
aLiOl[i].onmouseover=function(){
console.log(1);
if(iNow==0){
aLiUl[0].style.position='static';
oUl.style.top = 0;
};
for(var i=0;i<aLiOl.length;i++){
aLiOl[i].className='';
}
this.index=iNow;
this.className='active';
startMove(oUl,{top:-this.index*270});
}
}
timer=setInterval(run,1000);
oUl.onmouseover=function(){
clearInterval(timer)
};
oUl.onmouseout=function(){
timer=setInterval(run,1000);
};
function run(){
if(iNow==0){
aLiUl[0].style.position='static';
oUl.style.top = 0;
iNow2=0;
};
if(iNow==aLiOl.length-1){
iNow=0;
aLiUl[0].style.position='relative';
aLiUl[0].style.top=aLiUl.length*270 +'px'
}else{
iNow++;
}
iNow2++;
for(var i=0;i<aLiOl.length;i++){
aLiOl[i].className='';
}
aLiOl[iNow].className='active';
startMove(oUl,{top:-iNow2*270});
}
</script>
</body>
</html>
move.js

function startMove(obj,json,endFn){

        clearInterval(obj.timer);

        obj.timer = setInterval(function(){

            var bBtn = true;

            for(var attr in json){

                var iCur = 0;

                if(attr == 'opacity'){
                    if(Math.round(parseFloat(getStyle(obj,attr))*100)==0){
                    iCur = Math.round(parseFloat(getStyle(obj,attr))*100);

                    }
                    else{
                        iCur = Math.round(parseFloat(getStyle(obj,attr))*100) || 100;
                    }
                }
                else{
                    iCur = parseInt(getStyle(obj,attr)) || 0;
                }

                var iSpeed = (json[attr] - iCur)/8;
            iSpeed = iSpeed >0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
                if(iCur!=json[attr]){
                    bBtn = false;
                }

                if(attr == 'opacity'){
                    obj.style.filter = 'alpha(opacity=' +(iCur + iSpeed)+ ')';
                    obj.style.opacity = (iCur + iSpeed)/100;

                }
                else{
                    obj.style[attr] = iCur + iSpeed + 'px';
                }


            }

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

                if(endFn){
                    endFn.call(obj);
                }
            }

        },30);

    }


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