js 自动播放幻灯片

[javascript]代码库
<!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>js 自动播放幻灯片</title>
<style>
body, div, ul, li {
    margin: 0;
    padding: 0;
}
ul {
    list-style-type: none;
}
body {
    text-align: center;
    font: 12px/20px Arial;
}
#box {
    position: relative;
    width: 492px;
    height: 172px;
    background: #fff;
    border-radius: 5px;
    border: 8px solid #CCC;
    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;
    opacity: 0.7;
    filter: alpha(opacity = 70);
    border-radius: 20px;
    background-color: #CCC;
}
#box .count li.current {
    color: #fff;
    opacity: 1;
    filter: alpha(opacity = 100);
    font-weight: 700;
    background-color: #666;
}
#tmp {
    width: 100px;
    height: 100px;
    position: absolute;
}
</style>
<script type="text/javascript">
window.onload = function ()
{
    var oBox = document.getElementById("box");
    var oList = oBox.getElementsByTagName("ul")[0];
    var aImg = oBox.getElementsByTagName("img");
    var timer = playTimer = null;
    var index = i = 0;
    var bOrder = true;
    var aTmp = [];
    var aBtn = null;
     
    //生成数字按钮
    for (i = 0; i < aImg.length; i++) aTmp.push("<li>" + (i + 1) + "</li>");
     
    //插入元素
    var oCount = document.createElement("ul");
    oCount.className = "count";
    oCount.innerHTML = aTmp.join("");
    oBox.appendChild(oCount);   
    aBtn = oBox.getElementsByTagName("ul")[1].getElementsByTagName("li");
     
    //初始化状态
    cutover();
     
    //按钮点击切换
    for (i = 0; i < aBtn.length; i++)
    {
        aBtn[i].index = i;
        aBtn[i].onmouseover = function ()
        {
            index = this.index;
            cutover()
        }
    }
     
    function cutover()
    {
        for (i = 0; i < aBtn.length; i++) aBtn[i].className = "";
        aBtn[index].className = "current";          
        startMove(-(index * aImg[0].offsetHeight))
    }
     
    function next()
    {
        bOrder ? index++ : index--;
        index <= 0 && (index = 0, bOrder = true);
        index >= aBtn.length - 1 && (index = aBtn.length - 1, bOrder = false)
        cutover()
    }
     
    playTimer = setInterval(next, 3000);
     
    //鼠标移入展示区停止自动播放
    oBox.onmouseover = function ()
    {
        clearInterval(playTimer)
    };
     
    //鼠标离开展示区开始自动播放
    oBox.onmouseout = function ()
    {
        playTimer = setInterval(next, 3000)
    };
    function startMove(iTarget)
    {
        clearInterval(timer);
        timer = setInterval(function ()
        {
            doMove(iTarget)
        }, 30)  
    }
    function doMove (iTarget)
    {       
        var iSpeed = (iTarget - oList.offsetTop) / 10;
        iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);        
        oList.offsetTop == iTarget ? clearInterval(timer) : oList.style.top = oList.offsetTop + iSpeed + "px"
    }
};
</script>
</head>
<body>
<div id="box">
  <div class="list">
    <ul>
      <li><img src="http://yuncode.net/Public/images/header/logo.gif" width="490" height="170" /></li>
      <li><img src="http://yuncode.net/Public/images/header/logo.gif" width="490" height="170" /></li>
      <li><img src="http://yuncode.net/Public/images/header/logo.gif" width="490" height="170" /></li>
      <li><img src="http://yuncode.net/Public/images/header/logo.gif" width="490" height="170" /></li>
      <li><img src="http://yuncode.net/Public/images/header/logo.gif" width="490" height="170" /></li>
    </ul>
  </div>
</div>
</body>
</html>
[代码运行效果截图]
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