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<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>自适应焦点图轮播</title>
<meta http-equiv="X-UA-Compatible" content="IE=8" />
<meta http-equiv="X-UA-Compatible" content="IE=9">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<!--
--------------------------------
*描述:jquery自适应焦点图轮播素材（基于别人的素材进行的优化）
*作者：方林
*版本:v1.0.0(2014.10.27)
*备注：所有的图片请务必保持统一尺寸
--------------------------------
-->
<style type="text/css">
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,input,button,p,th,td{margin:0;padding:0;}
body{min-width:320px;background-color:#f6f7f7;}
a,img{border:0;}
span{blr:expression(this.onFocus=this.blur())}
:focus{outline:0;} /*去掉a标签的虚线框，避免出现奇怪的选中区域*/
*{
-webkit-tap-highlight-color:rgba(255,0,0,0);}
.index_banner{position:relative;width:100%;}
.index_banner ul{overflow-x:hidden;}
.index_banner li{position:absolute;top:0;left:0;overflow:hidden;width:100%;}
.index_banner li a{display:block;margin:0 auto;}
.index_banner cite{position:absolute;bottom:-50%;left:50%;z-index:999;display:block;height:15px;_display:none;}
.index_banner cite span{float:left;display:block;margin:0 4px;width:12px;height:12px;border-radius:50%; background-color:#e5e5e5;opacity:.8;cursor:pointer;}
.index_banner cite span:hover{background-color:#f5f5f5;}
.index_banner cite span.cur{background-color:#1d8bd8;cursor:default;}
.clear{clear:both;}
</style>
</head>
<body>
<div class="index_banner" id="banner_tabs">
<ul>
<li><a href="#" target="_blank"><img src="http://img.shangdaotong.com/UploadImage/Adadvert/AdCreativeImage/201605190944260001.jpg" width="100%"></a></li>
<li><a href="#" target="_blank"><img src="http://img.shangdaotong.com/UploadImage/Adadvert/AdCreativeImage/201605191837390018.jpg" width="100%"></a></li>
</ul>
<!--此处的img是用来占位的，在实际使用中，可以另外制作一张全空的图片-->
<img style="visibility:hidden;" src="images/index_banner1.jpg" width="100%">
<cite>
<span class="cur"></span>
<span></span>
</cite>
<div class="clear"></div>
</div>
<script type="text/javascript">
(function(){
if(!Function.prototype.bind){
Function.prototype.bind = function(obj){
var owner = this,args = Array.prototype.slice.call(arguments),callobj = Array.prototype.shift.call(args);
return function(e){e=e||top.window.event||window.event;owner.apply(callobj,args.concat([e]));};
};
}
})();
var banner_tabs = function(id){
this.ctn = document.getElementById(id);
this.adLis = null;
this.btns = null;
this.animStep = 0.2;//动画速度0.1～0.9
this.switchSpeed = 6;//自动播放间隔(s)
this.defOpacity = 1;
this.tmpOpacity = 1;
this.crtIndex = 0;
this.crtLi = null;
this.adLength = 0;
this.timerAnim = null;
this.timerSwitch = null;
this.init();
};
banner_tabs.prototype = {
fnAnim:function(toIndex){
if(this.timerAnim){window.clearTimeout(this.timerAnim);}
if(this.tmpOpacity <= 0){
this.crtLi.style.opacity = this.tmpOpacity = this.defOpacity;
this.crtLi.style.filter = ‘Alpha(Opacity=‘ + this.defOpacity*100 + ‘)‘;
this.crtLi.style.zIndex = 0;
this.crtIndex = toIndex;
return;
}
this.crtLi.style.opacity = this.tmpOpacity = this.tmpOpacity - this.animStep;
this.crtLi.style.filter = ‘Alpha(Opacity=‘ + this.tmpOpacity*100 + ‘)‘;
this.timerAnim = window.setTimeout(this.fnAnim.bind(this,toIndex),50);
},
fnNextIndex:function(){
return (this.crtIndex >= this.adLength-1)?0:this.crtIndex+1;
},
fnSwitch:function(toIndex){
if(this.crtIndex==toIndex){return;}
this.crtLi = this.adLis[this.crtIndex];
for(var i=0;i<this.adLength;i++){
this.adLis[i].style.zIndex = 0;
}
this.crtLi.style.zIndex = 2;
this.adLis[toIndex].style.zIndex = 1;
for(var i=0;i<this.adLength;i++){
this.btns[i].className = ‘‘;
}
this.btns[toIndex].className = ‘cur‘
this.fnAnim(toIndex);
},
fnAutoPlay:function(){
this.fnSwitch(this.fnNextIndex());
},
fnPlay:function(){
this.timerSwitch = window.setInterval(this.fnAutoPlay.bind(this),this.switchSpeed*1000);
},
fnStopPlay:function(){
window.clearTimeout(this.timerSwitch);
},
init:function(){
this.adLis = this.ctn.getElementsByTagName(‘li‘);
this.btns = this.ctn.getElementsByTagName(‘cite‘)[0].getElementsByTagName(‘span‘);
this.adLength = this.adLis.length;
for(var i=0,l=this.btns.length;i<l;i++){
with({i:i}){
this.btns[i].index = i;
this.btns[i].onclick = this.fnSwitch.bind(this,i);
this.btns[i].onclick = this.fnSwitch.bind(this,i);
}
}
this.adLis[this.crtIndex].style.zIndex = 2;
this.fnPlay();
this.ctn.onmouseover = this.fnStopPlay.bind(this);
this.ctn.onmouseout = this.fnPlay.bind(this);
}
};
var player1 = new banner_tabs(‘banner_tabs‘);
</script>
</body>
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原文地址：http://www.cnblogs.com/zhouyx/p/5534384.html
