javascript - 图片的幻灯片效果
javascript 代码:
<script type="text/javascript">
function select_play() {
var select_play_box = document.getElementById("select_play_box");
var aUl = select_play_box.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
select_play_box.onmouseover = function () {
clearInterval(play)
}; //鼠标离开启动自动播放
select_play_box.onmouseout = function () {
autoPlay()
}; //自动播放函数
function autoPlay() {
play = setInterval(function () {
index++;
index >= aImg.length && (index = 0);
show(index);
}, 2500);
} 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>
html代码:
<div id="select_play_box">
<ul class="select_play_list">
<li class="select_play_current"><img src="d/a.jpg"/></li>
<li><img src="d/b.jpg"/></li>
<li><img src="d/c.jpg"/></li>
<li><img src="d/d.jpg"/></li>
</ul>
<ul class="select_play_count">
<li class="select_play_current">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
</div>
css代码:
#select_play_box {
position: relative;
width: 315px;
height: 272px;
background: #fff;
border-radius: 5px;
border: 8px solid #fff;
margin: 5px auto;
}
#select_play_box ul {
list-style-type: none;
}
#select_play_box ul, li {
margin:;
padding:;
}
#select_play_box .select_play_list {
position: relative;
width: 100%;
height: 100%;
overflow: hidden;
border: 1px solid #ccc;
}
#select_play_box .select_play_list li {
position: absolute;
top:;
margin-left: 15px;
margin-top: 5px;
width: 300px;
height: 170px;
opacity:;
filter: alpha(opacity=0);
}
#select_play_box .select_play_list img {
width:250px;
height: 250px;
}
#select_play_box .select_play_list li.select_play_current {
opacity:;
filter: alpha(opacity=100);
}
#select_play_box .select_play_count {
position: absolute;
right:;
bottom: 5px;
}
#select_play_box .select_play_count li {
text-align: center;
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;
}
#select_play_box .select_play_count li.select_play_current {
color: #fff;
opacity:;
filter: alpha(opacity=100);
font-weight:;
background: #f60;
}
完整html页面代码:
<!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>javascript - 图片的幻灯片效果</title>
<link type="text/css" href="sy/select_auto_image.css" rel="stylesheet"/>
</head>
<body onload="select_play()">
<div id="select_play_box">
<ul class="select_play_list">
<li class="select_play_current"><img src="d/a.jpg"/></li>
<li><img src="d/b.jpg"/></li>
<li><img src="d/c.jpg"/></li>
<li><img src="d/d.jpg"/></li>
</ul>
<ul class="select_play_count">
<li class="select_play_current">1</li>
<li>2</li>
<li>3</li>
<li>4</li>
</ul>
</div>
<script type="text/javascript">
function select_play() {
var select_play_box = document.getElementById("select_play_box");
var aUl = select_play_box.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
select_play_box.onmouseover = function () {
clearInterval(play)
}; //鼠标离开启动自动播放
select_play_box.onmouseout = function () {
autoPlay()
}; //自动播放函数
function autoPlay() {
play = setInterval(function () {
index++;
index >= aImg.length && (index = 0);
show(index);
}, 2500);
} 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>
</body>
</html>
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