详细代码：
<!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=gb2312" />
<title>无标题文档</title>
<style type="text/css">
#focus_m{position:relative; width:420px; height:384px; background:#133775}
.f_img_roll{width:350px; height:300px; position:relative;}
.f_img_roll img{position:absolute; left:0; top:0; width:350px; height:300px;}
.f_img_tree{position:absolute; width:75px; height:300px; right:3px; top:0;}
.f_img_tree div{position:absolute; z-index:300; top:3px; right:0; width:75px; height:47px; background:url(http://www.kuanghong.com/han/images/mask.gif) no-repeat;}
.f_img_tree ul{margin:0; padding:0; list-style:none; position:absolute; right:0;}
.f_img_tree li{width:60px; height:45px; border:1px solid #0066cc; margin-top:3px;}
.f_img_tree img{width:54px; height:39px; border:3px solid #000066; vertical-align:top;}
.f_con{color:#fff; height:70px;}
.f_con .title{font-size:14px; height:30px; line-height:30px; margin-top:5px; font-weight:bold; text-align:center;}
.f_con .title a:link, .f_con .title a:visited{color:#fff; text-decoration:none}
.f_con .title a:hover{text-decoration:underline}
.f_con .con{font-size:12px; padding:0 10px; height:40px; line-height:150%;}
</style>
<script type="text/javascript">
function $A(iterable) {
var results = [];
for (var i = 0; i < iterable.length; i++)results.push(iterable[i]);
return results;
}
Function.prototype.bind = function() {
var __method = this, args = $A(arguments), object = args.shift();
return function() {
return __method.apply(object, args.concat($A(arguments)));
}
}
var imgs = [
{max:'http://www.kuanghong.com/han/images/img_1.jpg', min:'http://www.kuanghong.com/han/images/img_1s.jpg', url:'#', title:'标题01标题01标题01标题01标题01', con:'内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01内容01'},
{max:'http://www.kuanghong.com/han/images/img_2.jpg', min:'http://www.kuanghong.com/han/images/img_2s.jpg', url:'#', title:'标题02标题02标题02标题02标题02', con:'内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02内容02'},
{max:'http://www.kuanghong.com/han/images/img_3.jpg', min:'http://www.kuanghong.com/han/images/img_3s.jpg', url:'#', title:'标题03标题03标题03标题03标题03', con:'内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03内容03'},
{max:'http://www.kuanghong.com/han/images/img_4.jpg', min:'http://www.kuanghong.com/han/images/img_4s.jpg', url:'#', title:'标题04标题04标题04标题04标题04', con:'内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04内容04'},
{max:'http://www.kuanghong.com/han/images/img_5.jpg', min:'http://www.kuanghong.com/han/images/img_5s.jpg', url:'#', title:'标题05标题05标题05标题05标题05', con:'内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05内容05'},
{max:'http://www.kuanghong.com/han/images/img_6.jpg', min:'http://www.kuanghong.com/han/images/img_6s.jpg', url:'#', title:'标题06标题06标题06标题06标题06', con:'内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06内容06'}
];
function Focus(){ this.initialize.apply(this, arguments) };
Focus.prototype = {
initialize: function(imgObj, focus, tim, speed){
this.imgs = imgObj;
this.tim = tim*1000 || 2000;
this.speed = speed || 0.3;
this.img_m = null; // 大图
this.img_m2 = null; // 大图2
this.lis = []; // 小图列表
this.mask = null; // 蒙板
this.title = null; // 标题
this.con = null; // 内容
this.cur = 0; // 当前位置
this.t = null; // 整体计时
this.tm = null; // mask位置
this.ti = null; // img 切换
this.stoped = true; // 停止状态
this.tem = 0; // 临时数据
this.loaded = {imgs:[], num:0}; // 加载进度
this.getElement(document.getElementById(focus));
this.preload();
},
preload: function(){
for(var i=0; i<this.imgs.length; i++){
this.loaded.imgs[i] = new Image();
this.loaded.imgs[i].onload = this.load_num.bind(this);
this.loaded.imgs[i].src = this.imgs[i].max;
}
},
load_num: function(){
this.loaded.num++;
if(this.loaded.num == this.imgs.length)
this.start();
},
getElement: function(focus){ // 获得蒙板，小图列表，标题/内容容器等。。。
var ds = focus.getElementsByTagName('div');
for(var i=0; i<ds.length; i++)
switch(ds[i].className){
case 'f_img_roll':
this.img_m = document.createElement('img');
this.img_m2 = document.createElement('img');
this.img_m.src = this.imgs[0].max;
this.img_m.style.zIndex = 101;
this.img_m2.style.zIndex = 100;
ds[i].onmouseover = this.stop.bind(this);
ds[i].onmouseout = this.start.bind(this);
ds[i].appendChild(this.img_m);
ds[i].appendChild(this.img_m2);
case 'f_img_tree':
this.mask = document.createElement('div');
this.mask.onmouseover = this.stop.bind(this);
this.mask.onmouseout = this.start.bind(this);
var ul = document.createElement('ul');
var oThis = this;
for(var n=0; n<this.imgs.length; n++){
this.lis[n] = document.createElement('li');
this.lis[n].n = n;
this.lis[n].innerHTML = '<img src="'+this.imgs[n].min+'" />';
this.lis[n].onmouseover = function(){ this.style.border = "1px solid #cc0000"; }
this.lis[n].onmouseout = function(){ this.style.border = "1px solid #0066cc"; }
this.lis[n].onclick = function(){ if(oThis.lis[oThis.cur] != this) oThis.nextFrame.call(oThis, this.n); }
ul.appendChild(this.lis[n]);
};
ds[i].appendChild (this.mask);
ds[i].appendChild (ul);
break;
case 'title':
this.title = ds[i];
this.title.innerHTML = this.imgs[0].title;
this.title.parentNode.onmouseover = this.stop.bind(this);
this.title.parentNode.onmouseout = this.start.bind(this);
break;
case 'con':
this.con = ds[i];
this.con.innerHTML = this.imgs[0].con;
break;
}
},
nextFrame: function(n){
if (this.t) clearTimeout(this.t);
if (this.tm) clearInterval(this.tm);
if (this.ti) clearInterval(this.ti);
if (n) this.cur = n-1;
var top = 0, posTo = 0;
if (n!=0 && this.imgs[this.cur+1]){
posTo = this.lis[this.cur+1].offsetTop;
this.cur = this.cur+1;
}else{
posTo = this.lis[0].offsetTop;
this.cur = 0;
}
this.tem = this.mask.offsetTop;
this.tem > posTo? top = 1 : top = 0;
this.tm = setInterval(this.moveTo.bind(this, top, posTo), 25);
},
moveTo: function(top, posTo){
if(!top){
if((this.tem+2) >= posTo+1){
clearInterval(this.tm);
this.mask.style.top = posTo+'px';
this.img_swap();
return;
}
this.tem += (posTo - this.tem) * this.speed
}else{
if((this.tem-2) <= posTo-1){
clearInterval(this.tm);
this.mask.style.top = posTo+'px';
this.img_swap();
return;
}
this.tem -= (this.tem-posTo)*this.speed;
}
this.mask.style.top = this.tem+'px';
},
img_swap: function(){
var t, b;
if(this.img_m.style.zIndex > this.img_m2.style.zIndex){
t = this.img_m;
b = this.img_m2;
}else{
t = this.img_m2;
b = this.img_m;
}
this.title.innerHTML = '<a href="'+this.imgs[this.cur].url+'">'+this.imgs[this.cur].title+'</a>';
this.con.innerHTML = this.imgs[this.cur].con;
b.src = this.imgs[this.cur].max;
/MSIE/.test(navigator.userAgent) ?
this.tem = t.style.filter ? t.style.filter.replace(/^.+=(\d+).+$/,'$1') : 100
: this.tem = t.style.opacity ? t.style.opacity*100 : 100;
if (this.ti) clearInterval(this.ti);
this.ti = setInterval(this.img_hid.bind(this, t, b), 25);
},
img_hid: function(t,b){
this.tem -= 7;
if (/MSIE/.test(navigator.userAgent))
t.style.filter = 'alpha(opacity='+this.tem+')';
else
t.style.opacity = this.tem/100;
if(this.tem <=0){
clearInterval(this.ti);
var tz = t.style.zIndex;
var bz = b.style.zIndex;
t.style.zIndex = bz
b.style.zIndex = tz;
if (/MSIE/.test(navigator.userAgent))
t.style.filter = 'alpha(opacity=100)';
else
t.style.opacity = 1;
if(this.stoped) return;
this.start(); // 继续循环
}
},
start: function(){
if(this.t) clearTimeout(this.t);
this.t = setTimeout(this.nextFrame.bind(this, null), this.tim);
this.stoped = false;
},
stop: function(){
clearTimeout(this.t);
this.stoped = true;
}
}
window.onload = function(){
var focus = new Focus(imgs,'focus_m');
//focus.start();
}
</script>
</head>
<body>
<div id="focus_m">
<div class="f_img_roll"></div><div class="f_img_tree"></div>
<div class="f_con">
<div class="title"></div>
<div class="con"></div>
</div>
</div>
</body>
</html>
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