纯CSS和jQuery实现的在页面顶部显示的进度条效果

<style type="text/css">
body{ margin:0; padding:0;}
@-moz-keyframes progressing {
0% {
width:0px;
}
100% {
width:100%;
}
}
@-webkit-keyframes progressing {
0% {
width:0px;
}
100% {
width:100%;
}
}
.progress {
width:100%;
height:5px;
overflow:hidden;
background-color:#27c0;
position:fixed;
:0;
left:0;
z-index:9;
-moz-animation:progressing 2s ease-out;
-webkit-animation:progressing 2s ease-out;
}
</style>
<p class="progress"></p>

<title>页面顶部显示的进度条效果</title>
<div id="web_loading"><div></div></div>
<script src="/ajaxjs/jquery-1.7.2.min.js" type="text/javascript"></script>
<script type="text/javascript">// < ![CDATA[
jQuery(document).ready(function(){
jQuery("#web_loading div").animate({width:"100%"},800,function(){
setTimeout(function(){jQuery("#web_loading div").fadeOut(500);
});
});
});
// ]]></script>
<style>
#web_loading{
z-index:99999;
width:100%;
}
#web_loading div{
width:0;
height:5px;
background:#FF9F15;
}
</style>