进度条效果

进度条效果
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{margin:0px auto; padding:0px;}
#wai{ 100%; height:150px;}
#out{ 300px; height:50px; border:1px solid #666; margin-top:200px;}
#inside{ 0%; height:50px; margin-left:0px; background-color:red;}
</style>
</head>

<body>
<div id="wai">
    <div id="out">
        <div id="inside"></div>
    </div>
</div>
<div style="50%; float:right">
<input type="button" value="开始" id="start" />
</div>
</body>
</html>
<script type="text/javascript">
var bfb = 0;
var ids;
var btn = document.getElementById("start");
btn.onclick = function()
{
    ids = window.setInterval("jia()",100);
    
    }
    function jia()
    {    if(bfb<100){
        bfb++;
                    }else{ window.clearInterval(ids);}
        var d =document.getElementById("inside");
        d.style.width = bfb+"%";
        }
</script>
效果图：