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{width: 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{ width: 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; width: 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');});