为什么就显示了一个PHP?????
<!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 m=document.getElementsByTagName("div")[0].childNodes;
for(i=0;i<=m.length;i++){
document.write(m[i].nodeName+"<br>");
document.write(m[i].nodeValue+"<br>");
document.write(m[i].nodeType+"<br>");
document.write("<br>");
</script>
</body>
</html>
