<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
*{margin:0;padding:0;}
#parent{
width: 300px;
height: 40px;
border: 1px solid #ccc;
border-radius: 20px;
margin: 30px auto;
}
#child{
width: 0;
height: 40px;
border-radius: 20px;
background: red;
}
#bfb{width: 50px;
margin: 0 auto;
font-size: 30px;
}
</style>
</head>
<body>
<div id="parent">
<div id="child">
</div>
</div>
<div id="bfb">
</div>
</body>
</html>
<script>
var parent = document.getElementById("parent");
var child = document.getElementById("child");
var timer = null;
//加上百分比
timer = setInterval(function(){
var speed = parseInt(Math.random()*4);
if(child.offsetWidth>parent.offsetWidth){
clearInterval(timer)
}else{
child.style.width = child.offsetWidth+speed+"px";
}
var n = (child.offsetWidth/parent.offsetWidth)>1?1:(child.offsetWidth/parent.offsetWidth); //n为加载的宽度占总宽度的比
document.getElementById("bfb").innerText=parseInt(n*100)+"%";
},30)
</script>
进度条，并显示进度百分比
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转载自www.cnblogs.com/ngdty/p/9483500.html
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