JS实现可切换图片的幻灯切换效果示例

2019-11-19 11:28:44

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本文实例讲述了JS实现可切换图片的幻灯切换效果。分享给大家供大家参考，具体如下：

<!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>JS切换图片幻灯切换效果</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;      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);      }    };  </script></head><body><div id="box">  <ul class="list">    <li class="current"><img src="img/3.jpg" width="320" height="240"/></li>    <li><img src="img/1.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/4.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>

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。

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