<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style>
ul { padding:0; margin:0; }
li { list-style:none; }
body { background:#333; }
#pic { width:400px; height:500px; position:relative; margin:0 auto; background:url(img/loader_ico.gif) no-repeat center #fff; }
#pic img { width:400px; height:500px; }
#pic ul { width:40px; position:absolute; top:0; right:-50px; }
#pic li { width:40px; height:40px; margin-bottom:4px; background:#666; }
#pic .active { background:#FC3; }
#pic span { top:0; }
#pic p { bottom:0; margin:0; }
#pic p,#pic span { position:absolute; left:0; width:400px; height:30px; line-height:30px; text-align:center; color:#fff; background:#000; }
</style>
<script>
window.onload = function (){
var oDiv = document.getElementById('pic');
var oImg = oDiv.getElementsByTagName('img')[0];
var oSpan = oDiv.getElementsByTagName('span')[0];
var oP = oDiv.getElementsByTagName('p')[0];
var oUl = oDiv.getElementsByTagName('ul')[0];
var aLi = oUl.getElementsByTagName('li');
var arrUrl = [ 'img/1.png', 'img/2.png', 'img/3.png', 'img/4.png' ];
var arrText = [ '小宠物', '图片二', '图片三', '面具' ];
var num = 0;
var oldLi = null;
for( var i=0; i<arrUrl.length; i++ ){
oUl.innerHTML += '<li></li>';
}
//一定要在 li 创建 后
oldLi = aLi[num];
// 初始化
oImg.src = arrUrl[num];
oSpan.innerHTML = 1+num+' / '+arrUrl.length;
oP.innerHTML = arrText[num];
aLi[num].className = 'active';
for( var i=0; i<aLi.length; i++ ){
aLi[i].index = i; // 索引值
aLi[i].onclick = function (){
oImg.src = arrUrl[ this.index ];
oP.innerHTML = arrText[ this.index ];
oSpan.innerHTML = 1+this.index + ' / '+arrText.length;
/*
<li class="active"></li>
<li></li>
<li></li>
<li></li>
*/
// 思路一：全部清空，当前添加
// for( var i=0; i<aLi.length; i++ ){
// aLi[i].className = '';
// }
// this.className = 'active';
// 思路二：清空上个，当前添加
oldLi.className = '';
oldLi = this;
this.className = 'active';
};
}
};
</script>
</head>
<body>
<div id="pic">
<img src="" />
<span>数量正在加载中……</span>
<p>文字说明正在加载中……</p>
<ul></ul>
</div>
</body>
</html>