<html>
<style type="text/css">
#bar{width:0px; height:20px;
     background:#ee00ff;}//定义进度条的前景色
</style>
<script>
   var act;
   function over(){
     var w=document.getElementById("bar").style.pixelWidth;
     if (w<400){
                 document.getElementById("bar").style.pixelWidth=w+2;
                 document.getElementById("txt").innerText="Loading..."+Math.floor((w/400)*100)+"%";
                 clearTimeout(act);
                 act=setTimeout(over,10);
     }  else{document.getElementById("txt").innerText="载入完成100%";
     };

   };
   function out(){
     var w=document.getElementById("bar").style.pixelWidth;
     if (w>0){
                 document.getElementById("bar").style.pixelWidth=w-2;
                 document.getElementById("txt").innerText="Loading..."+Math.floor((w/400)*100)+"%";
                 clearTimeout(act);
                 act=setTimeout(out,10);
     }  else{document.getElementById("txt").innerText="载入完成0%";
     };

   };
   function Apouse(){
                 clearTimeout(act);
   };
</script>
<button onclick="over()">开始转入</button><br>
<button onclick="out()">开始卸载</button><br><br>
<button onclick="Apouse()">暂停</button><br><br>


<h4  id="txt">等待载入</h4>
<div id="bar"></div>

</html>

　　

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