淘宝首页图片切换效果是怎么做的呢？
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悬赏园豆：5
[已解决问题]
解决于 2012-04-05 08:20
请问淘宝首页图片切换效果是怎么做，我主要想问的是图片向上移动的速度是变化(逐渐减小)的，所以给人的感觉是比较平滑的效果，这个是怎么做的呢？
最佳答案
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http://www.cnblogs.com/NNUF/archive/2012/03/20/2375355.html
原生JS与JQURY的实现方法都有，封装的和函数式的写法也哟，注释很全面
收获园豆：5
谢谢，我测试一下
其他回答(3)
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就是一个运动曲线函数，你去网上搜索就有了，可以调整g的大小。
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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" />
<title>轮播广告</title>
<style>
body,div,ul,li{margin:0;padding:0;}
ul{list-style-type:none;}
body{background:#000;text-align:center;font:12px/20px Arial;}
#box{position:relative;width:492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;cursor:pointer;}
#box .list{position:relative;width:490px;height:170px;overflow:hidden;}
#box .list ul{position:absolute;top:0;left:0;}
#box .list li{width:490px;height:170px;overflow:hidden;}
#box .count{position:absolute;right:0;bottom:5px;}
#box .count li{color:#fff;float:left;width:20px;height:20px;cursor:pointer;margin-right:5px;overflow:hidden;background:#F90;opacity:0.7;filter:alpha(opacity=70);border-radius:20px;}
#box .count li.current{color:#fff;opacity:1;filter:alpha(opacity=100);font-weight:700;background:#f60;}
#tmp{width:100px;height:100px;background:red;position:absolute;}
</style>
<script type="text/javascript">
//获取ID
var $ = function (id) {return typeof id === "string" ? document.getElementById(id) : id};
//获取tagName
var $$ = function (tagName, oParent) {return (oParent || document).getElementsByTagName(tagName)};
//自动播放对象
var AutoPlay = function (id) {this.initialize(id)};
AutoPlay.prototype = {
initialize: function (id)
{
var oThis = this;
this.oBox = $(id);
this.oUl = $$("ul", this.oBox)[0];
this.aImg = $$("img", this.oBox);
this.timer = null;
this.autoTimer = null;
this.iNow = 0;
this.creatBtn();
this.aBtn = $$("li", this.oCount);
this.toggle();
this.autoTimer = setInterval(function ()
{
oThis.next()
}, 3000);
this.oBox.onmouseover = function ()
{
clearInterval(oThis.autoTimer)
};
this.oBox.onmouseout = function ()
{
oThis.autoTimer = setInterval(function ()
{
oThis.next()
}, 3000)
};
for (var i = 0; i < this.aBtn.length; i++)
{
this.aBtn[i].index = i;
this.aBtn[i].onmouseover = function ()
{
oThis.iNow = this.index;
oThis.toggle()
}
}
},
creatBtn: function ()
{
this.oCount = document.createElement("ul");
this.oFrag = document.createDocumentFragment();
this.oCount.className = "count";
for (var i = 0; i < this.aImg.length; i++)
{
var oLi = document.createElement("li");
oLi.innerHTML = i + 1;
this.oFrag.appendChild(oLi)
}
this.oCount.appendChild(this.oFrag);
this.oBox.appendChild(this.oCount)
},
toggle: function ()
{
for (var i = 0; i < this.aBtn.length; i++) this.aBtn[i].className = "";
this.aBtn[this.iNow].className = "current";
this.doMove(-(this.iNow * this.aImg[0].offsetHeight))
},
next: function ()
{
this.iNow++;
this.iNow == this.aBtn.length && (this.iNow = 0);
this.toggle()
},
doMove: function (iTarget)
{
var oThis = this;
clearInterval(oThis.timer);
oThis.timer = setInterval(function ()
{
var iSpeed = (iTarget - oThis.oUl.offsetTop) / 5;
iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
oThis.oUl.offsetTop == iTarget ? clearInterval(oThis.timer) : (oThis.oUl.style.top = oThis.oUl.offsetTop + iSpeed + "px")
}, 30)
}
};
window.onload = function ()
{
new AutoPlay("box");
};
</script>
</head>
<body>
<div >
<div >
<ul>
<li><img src="img/01.jpg" width="490" height="170" /></li>
<li><img src="img/02.jpg" width="490" height="170" /></li>
<li><img src="img/03.jpg" width="490" height="170" /></li>
<li><img src="img/04.jpg" width="490" height="170" /></li>
<li><img src="img/05.jpg" width="490" height="170" /></li>
</ul>
</div>
</div>
</body>
</html>
IE下不能用，报错
