老师，这个轮播怎么越转越快。有什么问题？
html:
<!DOCTYPE html>
<html>
<head>
<title>综合实例</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<div class="main" id="main">
<div class="banner" id="banner">
<a href="">
<div class="banner-slide slide1 slide-active"></div>
</a>
<a href="">
<div class="banner-slide slide2"></div>
</a>
<a href="">
<div class="banner-slide slide3 "></div>
</a>
</div>
<a href="javascript:void(0)" class="button prev"></a>
<a href="javascript:void(0)" class="button next"></a>
<div class="dots">
<span class="active"></span>
<span></span>
<span></span>
</div>
</div>
<script src="js/script.js"></script>
</body>
</html>
css：
*{
margin:0px;
padding:0pxs;
}
ul{
list-style: none;
}
body{
font-family: "微软雅黑";
color: #14191e;
}
.main{
width: 1200px;
height:460px;
margin:30px auto;
overflow: hidden;
position:relative;
}
.banner{
width:1200px;
height:460px;
position:relative;
}
.banner-slide{
width:1200px;
height:460px;
position: absolute;
background-repeat: no-repeat;
display: none;
}
.slide-active{
display: block;
}
.slide1{
background-image: url("../img/bg1.jpg");
}
.slide2{
background-image: url("../img/bg2.jpg");
}
.slide3{
background-image: url("../img/bg3.jpg");
}
.button{
position: absolute;
width:40px;
height: 80px;
left:244px;
top:50%;
margin-top:-40px;
background: url("../img/arrow.png") no-repeat center center;
}
.button:hover{
background-color: #333;
opacity: 0.8;
filter: alpha(opacity=80);
}
.prev{
transform: rotate(180deg);
}
.next{
left:auto;
right:0;
}
.dots{
position: absolute;
right:20px;
bottom: 24px;
text-align: right;
}
.dots span{
display: inline-block;
width:12px;
height: 12px;
line-height: 12px;
border-radius: 50%;
background:rgba(7,17,27,0.8);
box-shadow: 0 0 0 2px rgba(255,255,255,0.8) inset;
margin-left: 8px;
}
.dots span.active{
box-shadow: 0 0 0 2px rgba(7,17,27,0.4) inset;
background:#fff;
}
js：
function byId(id){
return typeof(id)==="string"?document.getElementById(id):id;
}
var index=0,
timer=null,
pics=byId("banner").getElementsByTagName("div"),
len=pics.length;
function slideImg(){
var main = byId("main");
main.onmouseover=function(){
if(timer) clearInterval(timer);
}
main.onmouseout=function(){
timer=setInterval(function(){
index++;
if(index>=len){
index=0;
}
changeImg();
},3000);
}
main.onmouseout();
}
function changeImg(){
for(var i=0;i<len;i++){
pics[i].style.display="none";
}
pics[index].style.display="block";
}
slideImg();
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