原生js自适应宽度焦点图切换_自适应焦点图切换代码



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特效描述:原生js 自适应宽度 焦点图切换 自适应焦点图切换,js自适应焦点轮播图

代码结构

1. 引入CSS

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

2. HTML代码

<div class="index_banner" id="banner_tabs">
	<ul>
		<li><a href="http://www.dijiuzhanzhang.com" target="_blank"><img src="images/index_banner1.jpg" width="100%"></a></li>
		<li><a href="http://www.dijiuzhanzhang.com" target="_blank"><img src="images/index_banner2.jpg" width="100%"></a></li>      
		<li><a href="http://www.dijiuzhanzhang.com" target="_blank"><img src="images/index_banner3.jpg" width="100%"></a></li>    
		<li><a href="http://www.dijiuzhanzhang.com" target="_blank"><img src="images/index_banner4.jpg" width="100%"></a></li>
		<li><a href="http://www.dijiuzhanzhang.com" target="_blank"><img src="images/index_banner5.jpg" width="100%"></a></li>
		<li><a href="http://www.dijiuzhanzhang.com" 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>



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