在线运行代码 - 菜鸟教程

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery UI 进度条（Progressbar） - 不确定的值</title>
  <link rel="stylesheet" href="https://apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
  <script src="https://apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="https://apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
  <link rel="stylesheet" href="jqueryui/style.css.html">
  <script>
  $(function() {
    $( "#progressbar" ).progressbar({
      value: false
    });
    $( "button" ).on( "click", function( event ) {
      var target = $( event.target ),
        progressbar = $( "#progressbar" ),
        progressbarValue = progressbar.find( ".ui-progressbar-value" );
 
      if ( target.is( "#numButton" ) ) {
        progressbar.progressbar( "option", {
          value: Math.floor( Math.random() * 100 )
        });
      } else if ( target.is( "#colorButton" ) ) {
        progressbarValue.css({
          "background": '#' + Math.floor( Math.random() * 16777215 ).toString( 16 )
        });
      } else if ( target.is( "#falseButton" ) ) {
        progressbar.progressbar( "option", "value", false );
      }
    });
  });
  </script>
  <style>#progressbar .ui-progressbar-value {
    background-color: #ccc;
  }
  </style>
</head>
<body>
 
<div id="progressbar"></div>
<button id="numButton">随机值 - 确定</button>
<button id="falseButton">不确定</button>
<button id="colorButton">随机颜色</button>
 
 
</body>
</html>
源代码

动行结果
