无缝滚动

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
* { margin: 0; padding: 0;}
body{ background-color:#1B1B1B}
#div1{ width: 100%; height:381px; position: relative; margin: 100px auto;overflow: hidden;}
#div1 ul { width: 800px; height: 381px; position: relative; }
#div1 ul li {width：25%; height: 381px; float: left; list-style: none; padding-right:20px;}
#div1 ul li img { width:100%; display: inline-block;}
a{ color: #B4B4B4; }
</style>
<script type="text/javascript">
window.onload=function(){
var odiv = document.getElementById('div1');
var oul = odiv.getElementsByTagName('ul')[0];
var ali = oul.getElementsByTagName('li');
var spa = -2;
oul.innerHTML=oul.innerHTML+oul.innerHTML;
oul.style.width=ali[0].offsetWidth*ali.length+'px';
function move(){
if(oul.offsetLeft<-oul.offsetWidth/2){
oul.style.left='0';
}
if(oul.offsetLeft>0){
oul.style.left=-oul.offsetWidth/2+'px'
}
oul.style.left=oul.offsetLeft+spa+'px';
}
var timer = setInterval(move,30)

odiv.onmousemove=function(){clearInterval(timer);}
odiv.onmouseout=function(){timer = setInterval(move,30)};
document.getElementsByTagName('a')[0].onclick = function(){
spa=-2;
}
document.getElementsByTagName('a')[1].onclick = function(){
spa=2;
}
}
</script>
</head>
<body>
<a href="#" style=" display: block; margin:0 auto; width: 50px;">向左走</a>
<a href="#" style=" display: block; margin:0 auto; width: 50px;">向右走</a>
<div id="div1">
<ul>
<li><img src="img/lym.png" /></li>
<li><img src="img/lym.png" /></li>
<li><img src="img/lym.png" /></li>
<li><img src="img/lym.png" /></li>
</ul>
</div>
</body>
</html>

无缝 滚动

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