轮播图

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" charset="utf-8" />
    <meta http-equiv="content-type" content="text/html" />
    <title>demo</title>
</head>
<style type="text/css">
*{margin:0;padding:0;}
ul,li,img{margin:0;padding:0;border:0;list-style-type:none;}
#list{height:250px;list-style-type:none;overflow:hidden;}
#luanpo{max-600px;height:200px;border:1px solid #CCC;margin:0 auto;position:relative;overflow:hidden;}

#imgs li{float:left;height:200px;600px;}
#imgs li img{height: 200px; 600px;}
#imgs{height:200px;background:#ddd;position:absolute;}
.a{background:red;}
.b{background:yellow;}

#num{overflow:auto;position:absolute;right:40%;bottom:0;}
#num li{float:left;height:30px;30px;text-align:center;line-height:30px;border:1px solid ;border-radius: 15px;margin-left:10px;cursor:pointer;z-index:2222;}
</style>
<body>
    <div id="luanpo">
        <ul id="imgs">
            <li><img src="image/P1_bg.jpg"></li>
            <li><img src="image/P2_bg.jpg"></li>
            <li><img src="image/P3_bg.jpg"></li>
            <li><img src="image/P1_bg.jpg"></li>
        </ul>
        <ul id="num">
            <li class="a">1</li>
            <li class="b">2</li>
            <li class="b">3</li>
            <li class="b">4</li>
        </ul>

    </div>

<script type="text/javascript">
var imgs=document.getElementById('imgs').getElementsByTagName('li');
var nums=document.getElementById("num").getElementsByTagName("li");
var luanpo=document.getElementById("luanpo");
var oimg=document.getElementById('imgs');
var iNow=0;
var dt=null;
oimg.style.width=imgs.length*imgs[0].offsetWidth+"px";

function tab(){
for(var i=0;i<nums.length;i++){
    nums[i].index=i;
    nums[i].onmousemove=function(){
        clearInterval(dt);
        iNow=this.index;
        for(var i=0;i<nums.length;i++){
            nums[i].className="b";
        }
        this.className="a";
        oimg.style.left=-(imgs[0].offsetWidth*iNow)+"px";    //这边可以加上我前面所写的那个缓动框架
    }
    nums[i].onmouseout=function(){
            start();
    }
}
}

function start(){
　　clearInterval(dt);
    dt=setInterval(function(){
        if(iNow>nums.length-2){
        iNow=0;
        }else{
        iNow++;
        }
        for(var k=0;k<nums.length;k++){
            if(iNow==nums[k].index){nums[k].className='a';}else{nums[k].className='b';}
        }
        oimg.style.left=-(imgs[0].offsetWidth*iNow)+"px";    //这边可以加上我前面所写的那个缓动框架
    },3000);
    tab();
}

start();

</script>
</body>
</html>