图片轮播

<!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" />
<style type="text/css" media="all">
	.d1{
		640px;
		height:auto;
		overflow:hidden;
		border:#666666 2px solid;
		background-color:#000000;
		position:relative;
	}
	.loading{
		443px;
		border:#666666 2px solid;
		background-color:#000000;
		color:#FFCC00;
		font-size:12px;
		height:179px;
		text-align:center;
		padding-top:30px;
		font-family:Verdana, Arial, Helvetica, sans-serif;
		font-weight:bold;
	}
	.d2{
		100%;
		height:480px;
		overflow:hidden;
	}
	.num_list{
		position:absolute;
		100%;
		left:0px;
		bottom:-1px;
		background-color:#000000;
		color:#FFFFFF;
		font-size:12px;
		padding:4px 0px;
		height:20px;
		overflow:hidden;
	}
	.num_list span{
		display:inline-block;
		height:16px;
		padding-left:6px;
	}
	img{
		border:0px;
	}
	ul{
		display:none;
	}
	.button{
		position:absolute;
		z-index:1000;
		right:0px;
		bottom:2px;
		font-size:13px;
		font-weight:bold;
		font-family:Arial, Helvetica, sans-serif;
	}
	.b1,.b2{
		background-color:#666666;
		display:block;
		float:left;
		padding:2px 6px;
		margin-right:3px;
		color:#FFFFFF;
		text-decoration:none;
		cursor:pointer;
	}
	.b2{
		color:#FFCC33;
		background-color:#FF6633;
	}
</style>
<script language="javascript" type="text/javascript">
	var s=function(){
	var interv=2000; //切换间隔时间
	var interv2=10; //切换速速
	var opac1=80; //文字背景的透明度
	var source="fade_focus" //焦点轮换图片容器的id名称;//获取对象
	function getTag(tag,obj){
		if(obj==null){
			return document.getElementsByTagName(tag)
			}else{
				return obj.getElementsByTagName(tag)
				}
				}
	function getid(id){
		return document.getElementById(id)
		};
	var opac=0,j=0,t=63,num,scton=0,timer,timer2,timer3;
	var id=getid(source);id.removeChild(getTag("div",id)[0]);
	var li=getTag("li",id);var div=document.createElement("div");
	var title=document.createElement("div");
	var span=document.createElement("span");
	var button=document.createElement("div");button.className="button";
	for(var i=0;i<li.length;i++){
		var a=document.createElement("a");a.innerHTML=i+1;a.onclick=function(){clearTimeout(timer);clearTimeout(timer2);clearTimeout(timer3);j=parseInt(this.innerHTML)-1;scton=0;t=63;opac=0;fadeon();};a.className="b1";a.onmouseover=function(){this.className="b2"};a.onmouseout=function(){this.className="b1";sc(j)};button.appendChild(a);}
	//控制图层透明度
	function alpha(obj,n){
		if(document.all){
			obj.style.filter="alpha(opacity="+n+")";
			}else{
				obj.style.opacity=(n/100);
				}
				}
	//控制焦点按钮
	function sc(n){
		for(var i=0;i<li.length;i++){
			button.childNodes[i].className="b1"
			};
			button.childNodes[n].className="b2";
			}
	title.className="num_list";title.appendChild(span);alpha(title,opac1);id.className="d1";div.className="d2";id.appendChild(div);id.appendChild(title);id.appendChild(button);
	//渐显
	var fadeon=function(){opac+=5;div.innerHTML=li[j].innerHTML;span.innerHTML=getTag("img",li[j])[0].alt;alpha(div,opac);if(scton==0){sc(j);num=-2;scrolltxt();scton=1};if(opac<100){timer=setTimeout(fadeon,interv2)}else{timer2=setTimeout(fadeout,interv);};}
	//渐隐
	var fadeout=function(){opac-=5;div.innerHTML=li[j].innerHTML;alpha(div,opac);if(scton==0){num=2;scrolltxt();scton=1};if(opac>0){timer=setTimeout(fadeout,interv2)}else{if(j<li.length-1){j++}else{j=0};fadeon()};}
	//滚动文字
	var scrolltxt=function(){t+=num;span.style.marginTop=t+"px";if(num<0 && t>3){timer3=setTimeout(scrolltxt,interv2)}else if(num>0 && t<62){timer3=setTimeout(scrolltxt,interv2)}else{scton=0}};
	fadeon();
	}
	//初始化
	window.onload=s;
</script>
<title>图片幻灯效果</title>
</head>
<body>
	<div align="center">
        <div id="fade_focus">
          <div class="loading">Loading...<br /><img src="./images/FIL917.JPG" width="640" height="480" /></div>
                <ul>
                  <li><a href="http://www.lishusheng.com" target="_blank"><img src="./images/FIL917.JPG" width="640" height="480" alt="展示图片1" /></a></li>
                  <li><a href="http://www.lishusheng.com" target="_blank"><img src="./images/FIL953.JPG" width="640" height="480" alt="展示图片2" /></a></li>
                  <li><a href="http://www.lishusheng.com" target="_blank"><img src="./images/FIL971.JPG" width="640" height="480" alt="展示图片3" /></a></li>
                  <li><a href="http://www.lishusheng.com" target="_blank"><img src="./images/FIL1038.JPG" width="640" height="480" alt="展示图片4" /></a></li>
                  <li><a href="http://www.lishusheng.com" target="_blank"><img src="./images/FIL1213.JPG" width="640" height="480" alt="展示图片5" /></a></li>
                </ul>
        </div>
	</div>
</body>
</html>
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原文地址：https://www.cnblogs.com/bimgoo/p/2529099.html