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JS+CSS实现淡入式焦点图片幻灯切换效果的方法

时间：2021-12-29 22:38 编辑：来源：阅读：
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摘要：JS+CSS实现淡入式焦点图片幻灯切换效果的方法

本文实例讲述了JS+CSS实现淡入式焦点图片幻灯切换效果的方法。分享给大家供大家参考。具体实现方法如下：

<!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>一款JS+CSS淡入式焦点图片幻灯切换效果</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;

 //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 () {

   index++;

   index >= aImg.length && (index = 0);

   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="/images/m01.jpg" width="320" height="240" /></li>

        <li><img src="/images/m02.jpg" width="320" height="240" /></li>

        <li><img src="/images/m03.jpg" width="320" height="240" /></li>

        <li><img src="/images/m04.jpg" width="320" height="240" /></li>

        <li><img src="/images/m05.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>

希望本文所述对大家的javascript程序设计有所帮助。

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