自己写的代码，供参考
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{margin:0;
padding:0;
list-style:none;}
.wrap{height:170px;
width:490px;
margin:60px auto;
overflow: hidden;
position: relative;
margin:100px auto;}
.wrap ul{position:absolute;}
.wrap ul li{height:170px;}
.wrap ol{position:absolute;
right:5px;
bottom:10px;}
.wrap ol li{height:20px; width: 20px;
background:#ccc;
border:solid 1px #666;
margin-left:5px;
color:#000;
float:left;
line-height:center;
text-align:center;
cursor:pointer;}
.wrap ol .on{background:#E97305;
color:#fff;}
</style>
<script type="text/javascript">
window.onload=function(){
var wrap=document.getElementById('wrap'),
pic=document.getElementById('pic'),
imgs=pic.getElementsByTagName('li'),
list=document.getElementById('list').getElementsByTagName('li'),
index=0,
timer=null;
if(imgs.length !== list.length) return;
for(var i=0;i<list.length;i++){
list[i].id=i;
list[i].onmouseover=function(){
chang(this.id);
}
}
function auto(){
timer=setInterval(function(){
index++;
if(index>=list.length){
index=0;
}
chang(index);
},2000);
}
auto();
function chang(curindex){
for(var j=0;j<list.length;j++){
list[j].className='';
imgs[j].style.display='none';
}
list[curindex].className='on';
imgs[curindex].style.display='block';
index = curindex;
}
wrap.onmouseover=function(){
clearInterval(timer);
timer=null;
}
wrap.onmouseout=function(){
auto();
}
}
</script>
</head>
<body>
<div class="wrap" id='wrap'>
<ul id="pic">
<li><img src="http://img1.sycdn.imooc.com//54111cd9000174cd04900170.jpg" alt=""></li>
<li><img src="http://img1.sycdn.imooc.com//54111dac000118af04900170.jpg" alt=""></li>
<li><img src="http://img1.sycdn.imooc.com//54111d9c0001998204900170.jpg" alt=""></li>
<li><img src="http://img1.sycdn.imooc.com//54111d8a0001f41704900170.jpg" alt=""></li>
<li><img src="http://img1.sycdn.imooc.com//54111d7d00018ba604900170.jpg" alt=""></li>
</ul>
<ol id="list">
<li class="on">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ol>
</div>
</body>
</html>
