<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
.slide{
width: 800px;
height: 200px;
border:1px solid red;
margin: 100px auto;
}
ul{
padding:0;margin:0;
list-style: none;
width: 200%;
height: inherit;
border:3px solid blue;
}
.slide li{
width: 200px;
float: left;
border:1px solid springgreen;
box-sizing:border-box;
height: inherit;
}
</style>
</head>
<body>
<div class="slide">
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
</div>
</body>
</html>
<script>
var slide=document.querySelector(".slide ul");
var L=0;
//左边
var T=setInterval(function(){
if(L>-200){
L=L-1;
}else{
L=0;
slide.appendChild(slide.firstElementChild)
}
slide.style.marginLeft=L+"px";
},10)
</script>
原文：http://www.cnblogs.com/yaone/p/7307843.html