28.Bootstrap(中文教程)元件：Progress:进度条

ㄧ.进度条

<div class="component" id="demo">  <div class="progress">    <div class="progress-bar progress-bar-striped progress-bar-animated bg-danger" style="width:32%">      32%    </div>  </div></div>.demo.component{  padding: 50px;}

重点：

.progress外部结构.progress-bar进度条标籤，让标籤置中在进度条.progress-bar-striped进度条条纹.progress-bar-animated进度条特效让条纹动起来
5.加入.bg-danger改变颜色

codepen
参考：bootstrap4