https://loading.io ------ 进度条小图标的制作网站
通过加载状态事件制作进度条：
document.onreadystatechange页面加载状态改变时的事件；
document.readyState返回当前文档的状态（uninitialized--还未开始载入；loading--载入中；interactive--已加载，文档与用户可以开始交互；complete--载入完成）
e.g.<!DOCTYPE ht<html lang="en">
<head>
<meta charset="UTF-8">
<title>进度条2</title>
<style type="text/css"> //添加进度条的样式
.loading{
100%;
height: 100%;
position: fixed;
left: 0;
top: 0;
z-index: 100;
background: #ffffff;
}
.loading .pic{
64px;
height: 64px;
border: 1px solid red;
background: url("images/loading.gif");
/*剧中显示*/
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
margin: auto;
}
</style>
//引入jquery包
<script type="text/javascript" src="jquery-1.3.1.js"></script>
<script type="text/javascript">
// 页面加载状态改变时的事件
document.onreadystatechange = function () {
if(document.readyState == 'complete'){ //判断页面加载完成，加载的图标就隐藏
$(".loading").fadeOut();
}
}
</script>
</head>
<body>
<div class="loading">
<div class="pic"></div> //加载图标的显示
</div>
<img src="http://pic29.nipic.com/20130514/12477194_083818249176_2.jpg" alt="">
<img src="http://pic37.nipic.com/20140115/9448607_120900609000_2.jpg" alt="">
<img src="http://pic.58pic.com/58pic/11/15/53/43g58PICz9B.jpg" alt="">
<img src="http://pic3.nipic.com/20090519/2390580_090051082_2.jpg" alt="">
<img src="http://pic25.nipic.com/20121127/9026859_131523397124_2.jpg" alt="">
<img src="http://pic29.nipic.com/20130514/12477194_083818249176_2.jpg" alt="">
</body>
</html>