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//js需要改一下:
var t = document.getElementById('aa').style.paddingTop;
alert(t);
if (t.length < 1) t = 0;
else t = parseInt(t) + 10;
document.getElementById('aa').style.paddingTop = t + 'px';
<!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>
</head>
<body>
<div id="aa" style="border:1px solid #CCC;">TEST</div>
<script type="text/javascript">
var t = document.getElementById('aa').style.paddingTop;
if (t.length < 1) t = 0;
t += 10 + 'px';
document.getElementById('aa').style.paddingTop = t;
</script>
</body>
</html>
var top=parseInt(document.getElementById("aa").style.paddingTop)+10;
alert(top); //看看输出什么?
document.getElementById("aa").style.paddingTop=top+"px";