Bootstrap与jQuery实现动态进度条控制

<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <title>...</title>
  <!--在IE浏览器中运行最新的渲染模式-->
  <meta http-equiv="X-UA-Compatible" content="IE-Edge">
  <!--初始化移动浏览器显示-->
  <meta name="viewport" content="width-device-width,inital-scale=1">
  <link href="http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="external nofollow" rel="stylesheet">
  <link rel="stylesheet" type="text/css" href="index.css" rel="external nofollow" >
  <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
   <script src="http://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
   <script type="text/javascript">
     $(document).ready(function(){
       var value = 0;
       var time = 50;
       //进度条复位函数
       function reset( ) {
        value = 0
         $("#prog").removeClass("progress-bar-success").css("width","0%").text("等待启动");
         //setTimeout(increment,5000);
       }
       //百分数增加，0-30时为红色，30-60为黄色，60-90为蓝色，>90为绿色
       function increment( ) {
         value += 1;
         $("#prog").css("width",value + "%").text(value + "%");
         if (value>=0 && value<=30) {
           $("#prog").addClass("progress-bar-danger");
         }
         else if (value>=30 && value <=60) {
           $("#prog").removeClass("progress-bar-danger");
           $("#prog").addClass("progress-bar-warning");
         }
         else if (value>=60 && value <=90) {
           $("#prog").removeClass("progress-bar-warning");
           $("#prog").addClass("progress-bar-info");
         }
         else if(value >= 90 && value<100) {
           $("#prog").removeClass("progress-bar-info");
           $("#prog").addClass("progress-bar-success");
         }
         else{
           setTimeout(reset,3000);
           return;
         }
         st = setTimeout(increment,time);
       }
       increment();
       //进度条停止与重新开始
       $("#stop").click(function () {
         if ("stop" == $("#stop").val()) {
           //$("#prog").stop();
           clearTimeout(st);
           $("#prog").css("width","0%").text("等待启动");
           $("#stop").val("start").text("重新开始");
         } else if ("start" == $("#stop").val()) {
           increment();
           $("#stop").val("stop").text("停止");
         }
       });
       //进度条暂停与继续
       $("#pause").click(function() {
         if ("pause" == $("#pause").val()) {
           //$("#prog").stop();
           clearTimeout(st);
           $("#pause").val("goon").text("继续");
         } else if ("goon" == $("#pause").val()) {
           increment();
           $("#pause").val("stop").text("暂停");
         }
       });
     });
   </script>
</head>
<body>
  <div class="progress progress-striped active">
    <div id="prog" class="progress-bar" role="progressbar" aria-valuenow="" aria-valuemin="0" aria-valuemax="100" style="width:0%;">
      <span id="proglabel">正在启动，请稍后......</span>
    </div>
  </div>
  <div class="form-group">
    <div class="col-sm-offset-4 col-sm-6">
      <button id="pause" class="btn btn-primary" value="pause">暂停</button>
      <button id="stop" class="btn btn-primary" value="stop">停止</button>
      <!--<button id="goon" class="btn btn-primary">继续<button>-->
    </div>
  </div>
</body>
</html>