Bootstrap 3 进度条的实现

<div class="progress">
 <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%;">
 <span class="sr-only">60% complete</span>
 </div>
</div>

<div class="progress">
 <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%;">
 60%
 </div>
</div>

<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>
<div class="progress">
 <div class="progress-bar" role="progressbar" aria-valuenow="2" aria-valuemin="0" aria-valuemax="100" style="min-width: 2em; width: 2%;">
 2%
 </div>
</div>

<div class="progress">
 <div class="progress-bar progress-bar-success" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 40%">
 <span class="sr-only">40% complete (success)</span>
 </div>
</div>
<div class="progress">
 <div class="progress-bar progress-bar-info" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
 <span class="sr-only">20% complete</span>
 </div>
</div>
<div class="progress">
 <div class="progress-bar progress-bar-warning" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%">
 <span class="sr-only">60% complete (warning)</span>
 </div>
</div>
<div class="progress">
 <div class="progress-bar progress-bar-danger" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100" style="width: 80%">
 <span class="sr-only">80% complete (danger)</span>
 </div>
</div>

<div class="progress">
 <div class="progress-bar progress-bar-success progress-bar-striped" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 40%">
 <span class="sr-only">40% complete (success)</span>
 </div>
</div>
<div class="progress">
 <div class="progress-bar progress-bar-info progress-bar-striped" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
 <span class="sr-only">20% complete</span>
 </div>
</div>
<div class="progress">
 <div class="progress-bar progress-bar-warning progress-bar-striped" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%">
 <span class="sr-only">60% complete (warning)</span>
 </div>
</div>
<div class="progress">
 <div class="progress-bar progress-bar-danger progress-bar-striped" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100" style="width: 80%">
 <span class="sr-only">80% complete (danger)</span>
 </div>
</div>

<div class="progress">
 <div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 45%">
 <span class="sr-only">45% complete</span>
 </div>
</div>

<div class="progress">
 <div class="progress-bar progress-bar-success" style="width: 35%">
 <span class="sr-only">35% complete (success)</span>
 </div>
 <div class="progress-bar progress-bar-warning progress-bar-striped" style="width: 20%">
 <span class="sr-only">20% complete (warning)</span>
 </div>
 <div class="progress-bar progress-bar-danger" style="width: 10%">
 <span class="sr-only">10% complete (danger)</span>
 </div>
</div>