bootstrap怎么设置进度条

<div class="progress-bar" aria-valuenow="40" aria-valuemax="100" aria-valuemin="0" style="width:40%;">

    
    
    <link rel="stylesheet" href="../libs/bootstrap-3.3.7/css/bootstrap.css">



    
默认的进度条
    

        

        
    

<div class="progress">
    <div class="progress-bar progress-bar-success"style="width: 90%;">
    </div>
</div>
<div class="progress">
    <div class="progress-bar progress-bar-info" style="width: 30%;">
    </div>
</div>
<div class="progress">
    <div class="progress-bar progress-bar-warning" style="width: 20%;">
    </div>
</div>
<div class="progress">
    <div class="progress-bar progress-bar-danger" style="width: 10%;">
    </div>
</div>

<div class="progress progress-striped">
    <div class="progress-bar progress-bar-success" style="width: 90%;">
    </div>
   </div>

<div class="progress progress-striped active">
    <div class="progress-bar progress-bar-success" 
         style="width: 40%;">
    </div>
  </div>