<title>Bootstrap 实例 - 堆叠的进度条</title>
<link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">
<script src="/js/bootstrap/jquery.min.js"></script>
<script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
<div class="progress-bar progress-bar-success" role="progressbar"
aria-valuenow="60" aria-valuemin="0" aria-valuemax="100"
<span class="sr-only">40% 完成</span>
<div class="progress-bar progress-bar-info" role="progressbar"
aria-valuenow="60" aria-valuemin="0" aria-valuemax="100"
<span class="sr-only">30% 完成（信息）</span>
<div class="progress-bar progress-bar-warning" role="progressbar"
aria-valuenow="60" aria-valuemin="0" aria-valuemax="100"