<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>幻灯片切换效果</title>
<style>
p {margin: 0;}
body {text-align: center;}
#box {width: 400px; height: 400px; border: 10px solid #ccc; margin: 50px auto 0; position: relative;}
a {width: 40px; height: 40px; background: #fff; filter: alpha(opacity: 80); opacity: 0.8; position: absolute; top: 160px;
font-size: 18px; color: #000; text-align: center; line-height: 40px; text-decoration: none;}
a:hover {filter: alpha(opacity: 30); opacity: 0.3;}
#prev {left: 10px;}
#next {right: 10px;}
#p1 {width: 400px; height: 30px; line-height: 30px; text-align: center; background: #000;
color: #fff; font-size: 14px; filter: alpha(opacity: 80); opacity: 0.8; position: absolute; bottom: 0; left: 0;}
strong {width: 400px; height: 30px; line-height: 30px; text-align: center; background: #000; color: #fff;
font-size: 14px; filter: alpha(opacity: 80); opacity: 0.8; position: absolute; top: 0; left: 0;}
#img1 {width: 400px; height: 400px;}
span {position: absolute; width: 400px; height: 30px; line-height: 30px; text-align: center;
top: -50px; left: 0; font-family: \'微软雅黑\';}
</style>
<script>
window.onload = function() {
var oPrev = document.getElementById(\'prev\');
var oNext = document.getElementById(\'next\');
var oP = document.getElementById(\'p1\');
var oStrong = document.getElementById(\'strong1\');
var oImg = document.getElementById(\'img1\');
var aBtn = document.getElementsByTagName(\'input\');
var arrUrl = [\'img/2_1.jpg\', \'img/2_2.jpg\', \'img/2_3.jpg\', \'img/2_4.jpg\'];
var arrText = [\'文字一\', \'文字二\', \'文字三\', \'识文断字\'];
var num = 0;
var onOff = true;
aBtn[0].onclick = function() {
onOff = true;
document.getElementsByTagName(\'span\')[0].innerHTML = \'图片可从最后一张跳转到第一张循环切换\';
};
aBtn[1].onclick = function() {
onOff = false;
document.getElementsByTagName(\'span\')[0].innerHTML = \'图片只能到最后一张\或只能到第一张切换\';
};
// 初始化
function fnTab() {
oP.innerHTML = arrText[num];
oStrong.innerHTML = num + 1 + \' / \' + arrText.length;
oImg.src = arrUrl[num];
}
fnTab();
oPrev.onclick = function() {
num--;
if(num == -1) {
if(onOff) {
num = arrText.length - 1;
} else {
alert(\'这已经是第一张了，不能再往前了~~\');
num = 0;
}
//num = arrText.length-1;
}
fnTab();
};
oNext.onclick = function() {
num++;
if(num == arrText.length) {
if(onOff) {
num = 0;
} else {
alert(\'已经到最后一张啦~\');
num = arrText.length - 1;
}
}
fnTab();
};
};
</script>
</head>
<body>
<input type="button" value="循环切换" />
<input type="button" value="顺序切换" />
<div id="box">
<span>图片可从最后一张跳转到第一张循环切换</span>
<a id="prev" href="javascript:;"> < </a>
<a id="next" href="javascript:;">></a>
<p id="p1">图片文字加载中……</p>
<strong id="strong1">图片数量计算中……</strong>
<img id="img1" />
</div>
</body>
</html>
