`
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图片轮播,网上copy来的,原理还需要自己学习,有空分析

 
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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" />
<style type="text/css" media="all">
.d1 {
	width:443px;
	height:auto;
	overflow:hidden;
	border:#666666 2px solid;
	background-color:#000000;
	position:relative;
}
.loading {
	width: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 {
	width:100%;
	height:209px;
	overflow:hidden;
}
.num_list {
	position:absolute;
	width: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">
/*
power by: http://www.wxwdesign.cn
*/
//主函数
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>Javascript图片幻灯效果——wxwdesign.cn</title>
</head>
<body>
<div id="fade_focus">
  <div class="loading">Loading...<br />
    <img src="http://lib.kindcent.com/smallslider/rs/images/005.jpg" width="100" height="100" /></div>
  <ul>
    <li><a href="http://www.wxwdesign.cn" target="_blank"><img src="http://lib.kindcent.com/smallslider/rs/images/005.jpg" width="443" height="209" alt="展示图片1" /></a></li>
    <li><a href="http://www.wxwdesign.cn" target="_blank"><img src="http://lib.kindcent.com/smallslider/rs/images/002.jpg" width="443" height="209" alt="展示图片2" /></a></li>
    <li><a href="http://www.wxwdesign.cn" target="_blank"><img src="http://lib.kindcent.com/smallslider/rs/images/004.jpg" width="443" height="209" alt="展示图片3" /></a></li>
    <li><a href="http://www.wxwdesign.cn" target="_blank"><img src="http://js.alixixi.com/demo/346/346.jpg" width="443" height="209" alt="展示图片4" /></a></li>
    <li><a href="http://www.wxwdesign.cn" target="_blank"><img src="http://js.alixixi.com/demo/540/540.jpg" width="443" height="209" alt="展示图片5" /></a></li>
    <li><a href="http://www.wxwdesign.cn" target="_blank"><img src="http://js.alixixi.com/demo/328/328.jpg" width="443" height="209" alt="展示图片6" /></a></li>
  </ul>
</div>
</body>
</html>

 

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