js自适应宽度焦点图切换代码

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以下是 js自适应宽度焦点图切换代码的示例演示效果:

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HTML代码(index.html):

<!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>js自适应宽度焦点图切换代码</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, maximum-scale=2.0">

<link type="text/css" href="css/style.css" rel="stylesheet">

</head>
<body>

<div class="index_banner" id="banner_tabs">
	<ul>
		<li><a href="#" target="_blank"><img src="images/index_banner1.jpg" width="100%"></a></li>
		<li><a href="#" target="_blank"><img src="images/index_banner2.jpg" width="100%"></a></li>      
		<li><a href="#" target="_blank"><img src="images/index_banner3.jpg" width="100%"></a></li>    
		<li><a href="#" target="_blank"><img src="images/index_banner4.jpg" width="100%"></a></li>
		<li><a href="#" target="_blank"><img src="images/index_banner5.jpg" width="100%"></a></li>
		<li><a href="#" target="_blank"><img src="images/index_banner6.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">1</span>
		<span>2</span>
		<span>3</span>
		<span>4</span>
		<span>5</span>
		<span>6</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>
</html>

CSS代码(style.css):

/*****************************描述:jquery自适应焦点图轮播css*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*****************************/
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;}
.index_banner{position:relative;}
.index_banner ul{overflow:hidden;}
.index_banner li{position:absolute;top:0;left:0;overflow:hidden;width:100%;height:350px;}
.index_banner li a{display:block;margin:0 auto;}
.index_banner cite{position:absolute;bottom:10px;left:50%;z-index:999;display:block;margin-left:-144px;width:288px;height:15px;_display:none;}
.index_banner cite span{float:left;display:block;margin:0 4px;width:40px;height:8px;background-color:#e5e5e5;text-indent:-999em;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;}

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