<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<style type="text/css">
.message{
width:200px;
height:100px;
background-color:#CCC;}
</style>
</head>
<body>
<script type="text/javascript">
var node=document.createElement("p");
p.className="message";
var text=document.createTextNode("I love JavaScript!");
node.appendChild(text);
document.getElementsByTagName("body")[0].parentNode.appendChild(node);
</script>
</body>
</html>
p.className="message"; node.className="message";//是node不是p