为什么节点的类型和值都是underfined
<!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 mynode=document.getElementsByTagName('div')[0].childNodes;
for(var i=0;i<mynode.length;i++){
document.write(mynode[i].nodeName+' '+mynode.nodeType+' '+mynode.nodeValue+'</br>');
}
</script>
</body>
</html>
运行结果是
#text undefined undefined
P undefined undefined
#text undefined undefined
DIV undefined undefined
#text undefined undefined
H5 undefined undefined
#text undefined undefined
