当前位置 博文首页 > javascript实现图片轮换动作方法
图片轮换是一种相当复杂的技术，早些年基本用flash实现。这里有一个链接，教大家如何用flash实现它的。之所以用flash，是因为flash是基于帧的，这与图片轮换的原理相当接近。为了模拟帧的效果，我们要用到overflow把多余的部分遮罩掉，也就是flash中常说的遮罩层。在Flash中，连时间轴都是可视的，而我们则全凭想象力与数学来计算现在是到了哪一张图。加之，flash有Robert Penner大神的缓动公式，那实在太耀眼，直到script.aculo.us类库搞出自己的缓动公式，才扭转局面。
我们来看一看图片轮换的结构层。它应该包含框体，图片展示区，图片滑动层与分页栏。原谅我制造这么多词汇，因为没有个名词讲解就难以为继了，前人也没有做这样的总结，个个都不愿意分享一下。框体就是一个div元素，作用有两个：提供相册的边框与作为分页栏的包含块。如果不清楚什么叫包含块（containing block）的话，自己查阅CSS权威指南吧。接着下来图片展示区与图片滑动层，也就是我实现新式无缝滚动的那一种结构，一个很干净的无序列表，所有难点都转移到设置它的CSS上。至于图片展示区就是ul元素，大小为一张图片的大小；图片滑动层就是那个li元素，也只有一个li元素而已，利用CSS强制把它里面的图片不换行向左浮动，并设置li元素一个很大很大的宽度，好让它一行容纳所有图片。分页栏就是一个包含许多链接的span元素，和普通的水平菜单差不多，只不过要用绝对定位它安置到框体的右下角。
<div > <ul> <li> <a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img alt="月光下的花瓣" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s001.jpg" /> </a> <a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img alt="清澈的湖水" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s002.jpg" /> </a> <a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img alt="荒漠上的植物" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s003.jpg" /> </a> <a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img alt="末日霓虹" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s004.jpg" /> </a> <a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img alt="绿·生意" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s005.jpg" /> </a> <a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img alt="又是收获的季节" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s006.jpg" /> </a> </li> </ul> <span> <a href="#index1" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a> <a href="#index2" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >2</a> <a href="#index3" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >3</a> <a href="#index4" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >4</a> <a href="#index5" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >5</a> <a href="#index6" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >6</a> </span> </div>
#album {
position:relative;/*为分页栏准备的*/
width:400px;/*必须设置，为分页栏准备*/
height:300px;/*必须设置，为分页栏准备*/
border:10px solid #8080C0;
}
#album ul ,#album li {/*消除默认样式*/
padding:0;
margin:0;
list-style:none;
}
#album ul{
position:relative; /*为图片滑动区*/
height:300px;/*必须设置，用于隐藏图片滑动区多余的部分*/
width:400px;/*必须设置，用于隐藏图片滑动区多余的部分*/
overflow:hidden;
background:transparent url(http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s001.jpg) no-repeat 0 0;
}
#album li { /*图片滑动区*/
position:absolute;
width:1000%;/*让里面的所有图片并列显示*/
}
#album a {
float:left;
}
#album img {
display:block;
border:0;
}
#album span {/*分页栏*/
position:absolute;
right:0;
bottom:10px;
}
#album span a{
display:block;/*让其拥有盒子模型*/
margin-right:10px;/*错开格子*/
width:15px;/*呈正方形*/
height:15px;
line-height:15px;
text-align:center;/*居中显示*/
text-decoration:none;/*消除下划线*/
color:#808080;
background:transparent url(http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_button.gif) no-repeat -15px 0;
}
#album span a:hover ,#album span a.hover{
color:#F8F8F8;
background-position:0 0;
}
<!doctype html>
<title>javascript图片轮换 by 司徒正美</title>
<meta charset="utf-8"/>
<meta name="keywords" content="javascript图片轮换 by 司徒正美" />
<meta name="description" content="javascript图片轮换 by 司徒正美" />
<style type="text/css">
#album {
position:relative;/*为分页栏准备的*/
width:400px;/*必须设置，为分页栏准备*/
height:300px;/*必须设置，为分页栏准备*/
border:10px solid #8080C0;
}
#album ul ,#album li {/*消除默认样式*/
padding:0;
margin:0;
list-style:none;
}
#album ul{
position:relative; /*为图片滑动区*/
height:300px;/*必须设置，用于隐藏图片滑动区多余的部分*/
width:400px;/*必须设置，用于隐藏图片滑动区多余的部分*/
overflow:hidden;
background:transparent url(http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s001.jpg) no-repeat 0 0;
}
#album li { /*图片滑动区*/
position:absolute;
width:1000%;/*让里面的所有图片并列显示*/
}
#album a {
float:left;
}
#album img {
display:block;
border:0;
}
#album span {/*分页栏*/
position:absolute;
right:0;
bottom:10px;
}
#album span a{
display:block;/*让其拥有盒子模型*/
margin-right:10px;/*错开格子*/
width:15px;/*呈正方形*/
height:15px;
line-height:15px;
text-align:center;/*居中显示*/
text-decoration:none;/*消除下划线*/
color:#808080;
background:transparent url(http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_button.gif) no-repeat -15px 0;
}
#album span a:hover ,#album span a.hover{
color:#F8F8F8;
background-position:0 0;
}
</style>
<h4>javascript图片轮换 by 司徒正美</h4>
<div >
<ul>
<li>
<a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<img alt="月光下的花瓣" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s001.jpg" />
</a>
<a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<img alt="清澈的湖水" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s002.jpg" />
</a>
<a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<img alt="荒漠上的植物" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s003.jpg" />
</a>
<a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<img alt="末日霓虹" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s004.jpg" />
</a>
<a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<img alt="绿·生意" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s005.jpg" />
</a>
<a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<img alt="又是收获的季节" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s006.jpg" />
</a>
</li>
</ul>
<span>
<a href="#index1" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a>
<a href="#index2" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >2</a>
<a href="#index3" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >3</a>
<a href="#index4" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >4</a>
<a href="#index5" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >5</a>
<a href="#index6" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >6</a>
</span>
</div>
这个和我以前的系列一样，不用JS也可以点击实现切换。不过以前是用锚点来改变scrollTop的值，现在是改变scrollLeft的值。
如果不使用缓动效果，很简单。
var Rotate = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li")[0];
slide.innerHTML += slide.innerHTML;
var item = slide.getElementsByTagName("a"),
critical = item[item.length/2].offsetLeft,//临界值
distance = critical/(item.length/2),
delta = - distance;
(function(){//实现自动轮换图片
setTimeout(function(){
delta = delta - distance;
if(delta < -critical){
delta = - distance;
}
slide.style.left = delta + "px";//★★★★★★★★
setTimeout(arguments.callee,1500)
},1500)
})()
}
要使用缓动，就要动用我的缓动公式与transition函数，在星号的位置中调用。
<!doctype html>
<title>javascript图片轮换 by 司徒正美</title>
<meta charset="utf-8"/>
<meta name="keywords" content="javascript图片轮换 by 司徒正美" />
<meta name="description" content="javascript图片轮换 by 司徒正美" />
<style type="text/css">
#album {
position:relative;
width:400px;
height:300px;
border:10px solid #8080C0;
}
#album ul,#album li {
list-style:none;
margin:0;
padding:0;
}
#album ul {
position:relative;
height:300px;
width:400px;
overflow:hidden;
background:transparent url(http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s001.jpg) no-repeat 0 0;
}
#album li {
position:absolute;
width:1000%;
}
#album a {
float:left;
}
#album img {
display:block;
border:0;
}
#album span {
position:absolute;
right:0;
bottom:10px;
}
#album span a {
display:block;
margin-right:10px;
width:15px;
height:15px;
line-height:15px;
text-align:center;
text-decoration:none;
color:gray;
background:transparent url(http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_button.gif) no-repeat -15px 0;
}
#album span a:hover,#album span a.hover {
color:#F8F8F8;
background-position:0 0;
}
</style>
<script type="text/javascript">
var spring= function(pos) {
return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6));
}
var transition = function(el){
var options = arguments[1] || {},
begin = options.begin,//开始位置
change = options.change,//变化量
duration = options.duration || 500,//缓动效果持续时间
ftp = options.ftp || 50,
onEnd = options.onEnd || function(){},
ease = options.ease,//要使用的缓动公式
end = begin + change,//结束位置
startTime = new Date().getTime();//开始执行的时间
(function(){
setTimeout(function(){
var newTime = new Date().getTime(),//当前帧开始的时间
timestamp = newTime - startTime,//逝去时间
delta = ease(timestamp / duration);
el.style.left = Math.ceil(begin + delta * change) + "px"
if(duration <= timestamp){
el.style.left = end + "px";
onEnd();
}else{
setTimeout(arguments.callee,1000/ftp);
}
},1000/ftp)
})()
}
var Rotate = function(id){
try{document.execCommand("BackgroundImageCache", false, true);}catch(e){};
var container = document.getElementById(id),
slide = container.getElementsByTagName("li")[0],
paginater = container.getElementsByTagName("span")[0],
links = paginater.getElementsByTagName("a"),
length = links.length, aBefore = length, aIndex;
slide.innerHTML += slide.innerHTML;
var item = slide.getElementsByTagName("a"),
critical = item[length].offsetLeft,//临界值
distance = critical/length,
delta = - distance;
(function(){//实现自动轮换图片
setTimeout(function(){
delta = delta - distance;
if(delta < -critical){
delta = - distance;
}
aIndex = - delta/distance;
links[aBefore-1].className = "";
links[aIndex-1].className = "hover";
aBefore = aIndex;
transition(slide,{begin:delta,change:distance,ease:spring})
setTimeout(arguments.callee,1500)
},1500)
})()
}
window.onload = function(){
Rotate("album");
}
</script>
<h4>javascript图片轮换 by 司徒正美</h4>
<div >
<ul>
<li>
<a href="http://www.cnblogs.com/rubylouvre" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<img alt="月光下的花瓣" src="http://images.cnblogs.com/cnblogs_com/rubylouvre/199042/o_s001.jpg" />
</a>
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</li>
</ul>
<span>
<a href="#index1" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a>
<a href="#index2" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >2</a>
<a href="#index3" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >3</a>
<a href="#index4" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >4</a>
<a href="#index5" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >5</a>
<a href="#index6" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >6</a>
</span>
</div>
我们也可以像第一部分那样加入一个信息栏，这样程序就拥有三个定时器了，看起来让人有点头晕，现实中不提倡这样做，这里只是试范一下如何使用transition的回调函数罢了。
