知识点
进度条组件使用了 CSS3 的 transition 和 animation 属性来完成一些特效。这些特性在 Internet Explorer 9 或以下版本中、Firefox 的老版本中没有被支持。Opera 12 不支持 animation 属性。
基本实例
<div class="progress">
<div class="progress-bar" role="progressbar" aria-valuemax="100" aria-valuemin="0" aria-valuenow="60" style="width:60%;">
<span class="sr-only">60%</span>
</div>
</div>
设置了 aria-valuenow="60"，还需要设置 .progress-bar 的 width值，否则状态条不会显现。
如果需要显示进度条进度提示，直接除去 <span class="sr-only">60%</span> 的包裹。
在展示很低的百分比时，如果需要让文本提示能够清晰可见，可以为进度条设置 min-width 属性。
<div class="progress">
<div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" style="min-width: 2em;">
0%
</div>
</div>
根据情境变化效果
进度条组件使用与按钮和警告框相同的类，根据不同情境展现相应的效果。
.progress-bar-success
.progress-bar-info
.progress-bar-warning
.progress-bar-danger
条纹效果
- 为父级
.progress添加.progress-striped类 - 或者为
.progress-bar添加.progress-bar-striped类
动画效果
为 .progress-bar-striped 添加 .active 类，使其呈现出由右向左运动的动画效果。IE9 及更低版本的浏览器不支持。
实践
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="Resource-type" content="Document"/>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>组件-进度条</title>
<link href="css/bootstrap.min.css" rel="stylesheet" type="text/css" />
<script src="js/jquery-2.1.4.min.js" type="text/javascript"></script>
<script src="js/bootstrap.min.js" type="text/javascript"></script>
<style>
<!--
.line{border-top:1px solid #afd9ee;margin:20px 0;}
-->
</style>
</head>
<body>
<div class="container">
<div class="progress">
<div class="progress-bar" role="progressbar" aria-valuemax="100" aria-valuemin="0" aria-valuenow="60" style="width:60%;">
<span class="sr-only">60%</span>
</div>
</div>
<!--min-width-->
<div class="progress">
<div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100" style="min-width: 2em;">
0%
</div>
</div>
<!--情景颜色变化-->
<div class="progress">
<div class="progress-bar progress-bar-success" role="progressbar" aria-valuemax="100" aria-valuemin="0" aria-valuenow="20" style="width:20%;">
<span class="sr-only">progress-bar-success</span>
</div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-info" role="progressbar" aria-valuemax="100" aria-valuemin="0" aria-valuenow="40" style="width:40%;">
<span class="sr-only">progress-bar-info</span>
</div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-warning" role="progressbar" aria-valuemax="100" aria-valuemin="0" aria-valuenow="60" style="width:60%;">
<span class="sr-only">progress-bar-warning</span>
</div>
</div>
<div class="progress">
<div class="progress-bar progress-bar-danger" role="progressbar" aria-valuemax="100" aria-valuemin="0" aria-valuenow="80" style="width:80%;">
<span class="sr-only">progress-bar-danger</span>
</div>
</div>
<!--条纹效果的进度条-->
<div class="progress">
<div class="progress-bar progress-bar-striped" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
<span class="sr-only">progress-bar-striped</span>
</div>
</div>
<div class="progress progress-striped">
<div class="progress-bar" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 40%">
<span class="sr-only">progress-striped</span>
</div>
</div>
<!--条纹的动画效果-->
<div class="progress">
<div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width:60%">
<span class="sr-only">progress-bar-striped添加active</span>
</div>
</div>
<!--堆叠-->
<div class="progress">
<div class="progress-bar" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width:20%">
<span class="sr-only">progress-bar-striped添加active</span>
</div>
<div class="progress-bar progress-bar-info progress-bar-striped active" role="progressbar" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100" style="width:30%">
<span class="sr-only">progress-bar-striped添加active</span>
</div>
<div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width:40%">
<span class="sr-only">progress-bar-striped添加active</span>
</div>
</div>
</div>
</body>
</html>
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