JavaScript实现定时进度条及完成后图片切换

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<html> 
<head> 
  <meta charset="utf-8"> 
  <meta http-equiv="X-UA-Compatible" content="IE=edge"> 
  <meta name="viewport" content="width=device-width, initial-scale=1"> 
  <!-- 
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  <meta name="Generator" content="EditPlus®"> 
  <meta name="Author" content=""> 
  <meta name="Keywords" content=""> 
  <meta name="Description" content=""> 
  <title>Document</title> 
  <link href="" rel="stylesheet" /> 
  <style type="text/css"> 
    .progress{ 
      border:1px solid #000; 
      text-align:center; 
      height:5px; 
      width:500px; 
      margin:0 auto; 
    } 
    .progress-bar { 
      background:#000; 
      height:5px; 
 
    } 
  </style> 
  <script src="http://apps.bdimg.com/libs/jquery/1.9.1/jquery.min.js"></script> 
</head> 
<body> 
 
<div id="" class="progress"> 
  <div id="probar" class="progress-bar"> </div> 
  <h3 align="center"></h3> 
</div> 
 
<script type="text/javascript"> 
 
/******* 
方法一，setTimout()实现 
***************/ 
  var p = 0; 
  var iid; 
  var runtime = 6000/100; //默认6秒 
  function goCount(){    
    p++; 
    $("h3").html(p+'%'); 
    $(".progress-bar").css("width",p+"%"); 
    if (p == 100) 
    { 
      clearInterval(iid); 
      alert('进度条满了,切换下一项... do something'); 
    } 
  } 
  iid = setInterval(goCount,runtime); 
 
 
/******* 
方法二，setTimout()实现 
************* 
  var p = 0; 
  var tid; 
  var runtime = 6000/100; 
  function goCount(){   
    p++; 
    if (p <= 100) 
    { 
      //$(".progress-bar").html(p+'%'); 
      $(".progress-bar").css("width",p+"%"); 
      tid = setTimeout(goCount,runtime); 
    } else { 
      clearTimeout(tid); 
      alert('进度条满了,切换下一项...'); 
    } 
  } 
  setTimeout(goCount,runtime); 
***************/ 
</script> 
</body> 
</html>