转：js 自动播放——幻灯片效果(移动端) 淡入淡出效果

<!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">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<title>自动播放——幻灯片效果</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:492px;height:172px;background:#fff;border-radius:5px;border:8px solid #fff;margin:10px auto;}
#box .list{position:relative;width:490px;height:170px;overflow:hidden;border:1px solid #ccc;}
#box .list li{position:absolute;top:0;left:0;width:490px;height:170px;opacity:0;filter:alpha(opacity=0);}
#box .list li img{width: 100%;height: 100%;}
#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;}
/*所有width改为100%可兼容移动端*/
</style>
<script type="text/javascript">
window.onload = function (){
var oBox = document.getElementById('box');
var aUl = oBox.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" style="opacity: 1;"><img src="./img/01.jpg"></li>
<li><img src="./img/02.jpg"></li>
<li><img src="./img/03.jpg"></li>
<li><img src="./img/04.jpg"></li>
<li><img src="./img/05.jpg"></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>

转：js 自动播放——幻灯片效果(移动端) 淡入淡出效果

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