- CSS3与jquery结合实现一个动态的进度条，就像正式使用的进度条一样，模拟了进度条的动态加载过程，期间适时显示数字百分比，可看到进度条在由左向右变化，很有质感的动画效果。CSS3还可以实现超多的动态变化效果，这只是其中一个，学习CSS3，是一种流行趋势。
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<!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>
<title>CSS3模拟正在加载的动态进度条 显示数字百分比</title>
<style type="text/css">
*{box-sizing: border-box;}
html{height: 100%;}
body{background: #efeeea;background: linear-gradient(#f9f9f9, #cecbc4);background: -moz-linear-gradient(#f9f9f9, #cecbc4);background: -webkit-linear-gradient(#f9f9f9, #cecbc4);background: -o-linear-gradient(#f9f9f9, #cecbc4);color: #757575;font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;text-align: center;}
h1, p{padding:0; margin:0;}
.wrapper{width: 350px;margin: 200px auto;}
.wrapper p a{color:#757575; text-decoration:none;}
.wrapper .load-bar{width: 100%;height: 25px;border-radius: 30px;background: #dcdbd7;position: relative;box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8), inset 0 2px 3px rgba(0, 0, 0, 0.2);}
.wrapper .load-bar:hover .load-bar-inner, .wrapper .load-bar:hover #counter{animation-play-state: paused;-moz-animation-play-state: paused;-o-animation-play-state: paused;-webkit-animation-play-state: paused;}
.wrapper .load-bar-inner{height: 99%;width: 0%;border-radius: inherit;position: relative;background: #c2d7ac;background: linear-gradient(#e0f6c8, #98ad84);background: -moz-linear-gradient(#e0f6c8, #98ad84);background: -webkit-linear-gradient(#e0f6c8, #98ad84);background: -o-linear-gradient(#e0f6c8, #98ad84);box-shadow: inset 0 1px 0 rgba(255, 255, 255, 1), 0 1px 5px rgba(0, 0, 0, 0.3), 0 4px 5px rgba(0, 0, 0, 0.3);animation: loader 10s linear infinite;-moz-animation: loader 10s linear infinite;-webkit-animation: loader 10s linear infinite;-o-animation: loader 10s linear infinite;}
.wrapper #counter{position: absolute;background: #eeeff3;background: linear-gradient(#eeeff3, #cbcbd3);background: -moz-linear-gradient(#eeeff3, #cbcbd3);background: -webkit-linear-gradient(#eeeff3, #cbcbd3);background: -o-linear-gradient(#eeeff3, #cbcbd3);padding: 5px 10px;border-radius: 0.4em;box-shadow: inset 0 1px 0 rgba(255, 255, 255, 1), 0 2px 4px 1px rgba(0, 0, 0, 0.2), 0 1px 3px 1px rgba(0, 0, 0, 0.1);left: -25px;top: -50px;font-size: 12px;font-weight: bold;width: 44px;animation: counter 10s linear infinite;-moz-animation: counter 10s linear infinite;-webkit-animation: counter 10s linear infinite;-o-animation: counter 10s linear infinite;}
.wrapper #counter:after{content: "";position: absolute;width: 8px;height: 8px;background: #cbcbd3;transform: rotate(45deg);-moz-transform: rotate(45deg);-webkit-transform: rotate(45deg);-o-transform: rotate(45deg);left: 50%;margin-left: -4px;bottom: -4px;box-shadow: 3px 3px 4px rgba(0, 0, 0, 0.2), 1px 1px 1px 1px rgba(0, 0, 0, 0.1);border-radius: 0 0 3px 0;}
.wrapper h1{font-size: 28px;padding: 20px 0 8px 0;}
.wrapper p{font-size: 13px;} @keyframes loader{from{width: 0%;}
to{width: 100%;}
} @-moz-keyframes loader{from{width: 0%;}
to{width: 100%;}
} @-webkit-keyframes loader{from{width: 0%;}
to{width: 100%;}
} @-o-keyframes loader{from{width: 0%;}
to{width: 100%;}
} @keyframes counter{from{left: -25px;}
to{left: 323px;}
} @-moz-keyframes counter{from{left: -25px;}
to{left: 323px;}
} @-webkit-keyframes counter{from{left: -25px;}
to{left: 323px;}
} @-o-keyframes counter{from{left: -25px;}
to{left: 323px;}
}
.title {background-color:rgba(0,0,0,0.56); text-align:center; width:100%; position:fixed; top:0; left:0; padding:5px 0;}
.title a {color:#FFF; text-decoration:none; font-size:16px; font-weight:bolder; line-height:24px;}
</style>
<script src="http://www.codefans.net/ajaxjs/jquery-1.6.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
var interval = setInterval(increment,100);
var current = 0;
function increment(){
current++;
$('#counter').html(current+'%');
if(current == 100) { current = 0; }
}
$('.load-bar').mouseover(function(){
clearInterval(interval);
}).mouseout(function(){
interval = setInterval(increment,100);
});
});
</script>
</head>
<body>
<div class="title"><a>CSS3动态进度条</a></div>
<div class="wrapper">
<div class="load-bar">
<div class="load-bar-inner" data-loading="0"> <span id="counter"></span> </div>
</div>
<h1>Loading</h1>
<p>加载中，请稍候...</p>
</div>
</body>
</html>
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