js图片自动切换代码

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window.onload = function(){
	var aDiv = getClass(document,'.list');
	var	oUl = getClass(document,'.nav')[0],
	   aBtn = getTagName(oUl,'li');	   
	var timer = null,t = 0,b = 0;	
		
	fnAutoPlay(aDiv[0])
	
	//自动播放每一组播放完回调自已切换下一组
	function fnAutoPlay(e,n){
		var aLi = getTagName(e,'li'),
			 aP = getTagName(e,'p');
		var n = n||0;
		fnActive(aLi,aP,n%aLi.length)
		timer = setInterval(function(){
			n++	
			b = n
			fnActive(aLi,aP,n%aLi.length)			
			if(n%aLi.length === 0){
				clearInterval(timer)
				t++					
				fnActive(aBtn,aDiv,t%aDiv.length)
				fnAutoPlay(aDiv[t%aDiv.length])		
			}
		},1000)		
	}