html代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>轮播图练习</title>
<link rel="stylesheet" href="css/css.css" type="text/css"/>
</head>
<body>
<ul class="back"> <!-- 背景图片 -->
<li class="l1"></li>
<li class="l2"></li>
<li class="l3"></li>
<li class="l4"></li>
<li class="l5"></li>
</ul>
<ul class="point"> <!-- 控制按钮 -->
<li class="active"></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
<div class="btn"> <!-- 左右控制按钮 -->
<span class="prev"></span>
<span class="next"></span>
</div>
</body>
<script src="js/jquery-1.7.2.js"></script>
<script src="js/jq.js"></script>
</html>
css代码：
*{margin:0; padding: 0;}
ul li{list-style: none;}
.back{height: 400px; overflow: hidden; margin-top:100px;}
.back li{ 100%; height: 400px; margin:0 auto;}
.back li.l1{background: red;}
.back li.l2{background: yellow;}
.back li.l3{background: blue;}
.back li.l4{background: black;}
.back li.l5{background: green;}
.point{text-align: center; margin-top: -30px;}
.point li{ 20px; height: 20px; border:2px solid #fff; border-radius: 10px; box-sizing:border-box; display: inline-block;}
.point li.active{background: #fff;}
.btn{ position: relative;}
.btn span{ display: inline-block; vertical-align: top; 100px; height: 100px; background: rgba(0,0,0,.5); position: absolute; top:-235px; cursor: pointer;}
.btn .prev{left: 0}
.btn .next{ right: 0;}
js代码：
$(function(){
function banner(a,b,c,d,e){ // a是背景图，b是active，c是背景对应按钮，d是上一页，e是下一页
index=0;
len=$(a).length-1;
function teb(index){
$(c).eq(index).addClass(b).siblings('').removeClass(b);
$(a).eq(index).fadeIn(300).addClass('curr').siblings('').fadeOut(300).removeClass('curr');
};
$(c).click(function(){
index=$(this).index();
teb(index);
});
$(d).click(function(){
index--;
if(index<0){
index=len;
};
teb(index);
});
$(e).click(function(){
index++;
if(index>len){
index=0;
};
teb(index);
});
function timeRun(){
time=setInterval(function(){
index++;
if(index>len){
index=0;
};
teb(index);
},3000);
};
timeRun();
};
banner('.back>li','active','.point>li','.prev','.next');
});