为什么显示有7个节点 3个类型？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div>
javascript
<p>javascript</p>
<div>jQuery</div>
<h5>PHP</h5>
</div>
<script type="text/javascript">
var div=document.getElementsByTagName("div")[0].childNodes;
document.write("zijiediangeshu"+div.length+"<br />");
document.write("jiedianleixing"+div[0].nodeType);
</script>
</body>
</html>
