进度条的做法

代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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}
#kuang{ 200px; height:10px; border:1px solid #60F;}
#jindu{ height:10px; background-color:#F03; float:left}
</style>
</head>

<body>

<br />

<div id="kuang">
	<div id="jindu" style="0px"></div>
</div>

<script type="text/javascript">

window.setTimeout("jindu()",30);

//调一下进度前进1%
function jindu()
{
	//获取进度div的宽度
	var div = document.getElementById("jindu");
	
	//获取到的是字符串"0px"
	var str = div.style.width;
	
	//处理字符串获取数字
	var cd = str.substr(0,str.length-2);
	
	//判断长度是否到最大值
	if(cd<200)
	{	
		//将长度转为整数加2
		var cd = parseInt(cd)+2;
		
		//让进度的DIV长度变为cd
		div.style.width = cd+"px";
		
		//调用自身
		window.setTimeout("jindu()",30);
	}
}


</script>

</body>
</html>
　　效果如图：