CSS+JS自动改变切换方向的图片幻灯切换效果

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>CSS+JS自动改变切换方向的图片幻灯切换效果丨芯晴网页特效丨CsrCode.Cn</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:322px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;}
#box .list{position:relative;width:320px;height:240px;overflow:hidden;border:1px solid #ccc;}
#box .list li{position:absolute;top:0;left:0;width:320px;height:240px;opacity:0;filter:alpha(opacity=0);}
#box .list li.current{opacity:1;filter:alpha(opacity=100);}
#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">
window.onload = function ()
{
var oBox = document.getElementById("box");
var aUl = document.getElementsByTagName("ul");
var aImg = aUl[0].getElementsByTagName("li");
var aNum = aUl[1].getElementsByTagName("li");
var timer = play = null;
var i = index = 0;
var bOrder = true;
//切换按钮
for (i = 0; i < aNum.length; i++)
{
aNum[i].index = i;
aNum[i].onmouseover = function ()
{
   show(this.index)
}
}

//鼠标划过关闭定时器
oBox.onmouseover = function ()
{
clearInterval(play)
};

//鼠标离开启动自动播放
oBox.onmouseout = function ()
{
autoPlay()
};

//自动播放函数
function autoPlay ()
{
play = setInterval(function () {
   //判断播放顺序
   bOrder ? index++ : index--;

   //正序
   index >= aImg.length && (index = aImg.length - 2, bOrder = false);

   //倒序
   index <= 0 && (index = 0, bOrder = true);

   //调用函数
   show(index)
},2000);
}
autoPlay();//应用

//图片切换, 淡入淡出效果
function show (a)
{
index = a;
var alpha = 0;
for (i = 0; i < aNum.length; i++)aNum[i].className = "";
aNum[index].className = "current";
clearInterval(timer);

for (i = 0; i < aImg.length; i++)
{
   aImg[i].style.opacity = 0;
   aImg[i].style.filter = "alpha(opacity=0)";
}

timer = setInterval(function () {
   alpha += 2;
   alpha > 100 && (alpha =100);
   aImg[index].style.opacity = alpha / 100;
   aImg[index].style.filter = "alpha(opacity = " + alpha + ")";
   alpha == 100 && clearInterval(timer)
},20);
}
};
</script>
</head>
<body>
<div id="box">
    <ul class="list">
        <li class="current"><img src="//www.csrcode.cn/images/m06.jpg" width="320" height="240" /></li>
        <li><img src="//www.csrcode.cn/images/m07.jpg" width="320" height="240" /></li>
        <li><img src="//www.csrcode.cn/images/m08.jpg" width="320" height="240" /></li>
        <li><img src="//www.csrcode.cn/images/m09.jpg" width="320" height="240" /></li>
        <li><img src="//www.csrcode.cn/images/m10.jpg" width="320" height="240" /></li>
    </ul>
    <ul class="count">
        <li class="current">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
</div>
</body>
</html>

<br><br><hr><p align="center"><font color=skyblue>本特效由 <a href="http://www.CsrCode.cn" target="_blank">芯晴网页特效</a>丨CsrCode.Cn 收集于互联网，只为兴趣与学习交流，不作商业用途。来源：源码爱好者</font></p>

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