如何在Bootstrap 3进度条中给出计算出的宽度？

<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>

<div id="progress-bar" class="progress">
  <div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div>
</div>

var width = 计算出的宽度; // 根据具体计算逻辑获取宽度值，范围为0-100
$("#progress-bar .progress-bar").css("width", width + "%").attr("aria-valuenow", width);