Jquery图片自动幻灯片效果

效果如图：(poposlides插件可以实现幻灯片，但其为全屏效果用处相对较少)

首先Html文件：

<body>
<div id="box">
    <ul class="list">
        <li class="current"><img src="img/2.jpg" width="320" height="240" /></li>
        <li><img src="img/3.jpg" width="320" height="240" /></li>
        <li><img src="img/2.jpg" width="320" height="240" /></li>
        <li><img src="img/3.jpg" width="320" height="240" /></li>
        <li><img src="img/2.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>

其次css文件：

<style> 
body,div,ul,li{margin:0;padding:0;}
ul{list-style-type:none;}
#box{position:relative;width:322px;height:240px;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; text-align:center;}
#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>

最后，js文件（引入jQuery）：

$(function ()
{
 var oBox = $("#box");
 var aImg = $(".list").find("li");
 var aNum = $(".count").find("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
 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);
 }
});

Jquery图片自动幻灯片效果

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