JS实现可切换图片的幻灯切换效果示例
程序员文章站
2023-12-17 17:36:22
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：
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>
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