用javascript写的进度条，怎么获取进度条的值，按百分比显示出来
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>RunJS</title>
<style>
#progress{
border:1px solid black;
width:500px;
height:20px;
text-align:center;
}
#progress>div{
width:0px;
height:20px;
position:absolute;
background-color:yellow;
}
#progress>span{
color:red;
position:absolute;
}
</style>
<script type="text/javascript">
onload = function(){
var div = progress.querySelector("div");
var span = progress.querySelector("span");
var pw = parseFloat(progress.style.width) || parseFloat(getComputedStyle(progress).width) || progress.offsetWidth;
var interval = setInterval(function(){
var w = parseFloat(div.style.width) || parseFloat(getComputedStyle(div).width) || div.offsetWidth;
w+=10;
if(w>=pw){
w = pw;
clearInterval(interval);
}
div.style.width = w + "px";
span.innerHTML = w*100/pw + "%";
},60);
};
</script>
</head>
<body>
<div id="progress">
<div>
</div>
<span></span>
</div>
</body>
</html>
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