JQ 轮播图精简版

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>轮播图</title>
<style type="text/css">
/*base style*/
html, body, div, ul, li{ margin:0; padding:0;}
body{ font-family:\5FAE\8F6F\96C5\9ED1,'Arial'; color:#333; font-size:12px; background-color:#fff;}
img{ border:none;}
ul li{ list-style-type:none;}
/*lunbo style*/
#scrollPics{
	width:560px;
    height: 300px;
	margin:20px auto 0 auto;
    overflow: hidden;
    position:relative;
}
.num{
    position:absolute;
    right:5px; 
    bottom:5px;
}
#scrollPics .num li{
    float: left;
    color: #FF7300;
    text-align: center;
    line-height: 16px;
    width: 16px;
    height: 16px;
    cursor: pointer;
    overflow: hidden;
    margin: 3px 1px;
    border: 1px solid #FF7300;
    background-color: #fff;
}
#scrollPics .num li.on{
    color: #fff;
    line-height: 21px;
    width: 21px;
    height: 21px;
    font-size: 16px;
    margin: 0 1px;
    border: 0;
    background-color: #FF7300;
    font-weight: bold;
}
</style>
</head>
<body>
<div id="scrollPics">
    <ul class="slider" >
        <li><img src="2.jpg"/></li>
        <li><img src="3.jpg"/></li>
        <li><img src="4.jpg"/></li>
        <li><img src="5.jpg"/></li>
        <li><img src="1.jpg"/></li>
    </ul>
    <ul class="num" >
        <li class="on">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
</div>
<script type="text/javascript" src="jquery-1.10.1.min.js"></script>
<script type="text/javascript">
var len = $(".num > li").length;
var index = 0; //图片序号
var adTimer;
$(".num li").mouseover(function() {
	index = $(".num li").index(this); //获取鼠标悬浮 li 的index
	showImg(index);
}).eq(0).mouseover();
//滑入停止动画，滑出开始动画.
$('#scrollPics').hover(function() {
	clearInterval(adTimer);
}, function() {
	adTimer = setInterval(function() {
		showImg(index)
		index++;
		if (index == len) { //最后一张图片之后，转到第一张
			index = 0;
		}
	}, 3000);
}).trigger("mouseleave");
function showImg(index) {
	var adHeight = $("#scrollPics>ul>li:first").height();
	$(".slider").stop(true, false).animate({
		"marginTop": -adHeight * index + "px" //改变 marginTop 属性的值达到轮播的效果
	}, 1000);
	$(".num li").removeClass("on")
		.eq(index).addClass("on");
}
</script>
</body>
</html>
效果图：
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