<html>
<head>
<title>Untitled Document</title>
</head><body>
<div id="plugin">12</div>
<script language="JavaScript">
document.getElementById("plugin").innerText=parseInt(document.getElementById("plugin").innerText)+23;
</script>
</body>
</html>
<head>
<title>Untitled Document</title>
</head><body>
<div id="plugin">12</div>
<script language="JavaScript">
document.getElementById("plugin").innerText=parseInt(document.getElementById("plugin").innerText)+23;
</script>
</body>
</html>
<!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>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="Gao YiXiang" />
<meta name="email" content="[email protected]" />
<meta name="keywords" content="javascript dhtml dom" />
<meta name="description" content="I love web development." />
</head>
<body>
<div id="plugin">12</div>
<script type="text/javascript">
<!--
with (document.getElementById("plugin"))
{
innerHTML = parseInt(innerHTML) + 23;
}
//-->
</script>
</body>
</html>
送你三本手册！DHTML参考手册
http://download.csdn.net/source/308913样式表中文手册
http://download.csdn.net/source/304124JScript语言参考
http://download.csdn.net/source/308916