求问下面的代码哪里错了，为什么不能把PHP插到HTML前面
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<ul id="test"><li>JavaScript</li><li>HTML</li></ul>
<script type="text/javascript">
var otest = document.getElementById("test");
var newNode = document.createElement("li");
newNode.innerHTML ="PHP";
for(var i=0;i<otest.childNotes.length;i++){
if(otest.childNotes[i].innerHTML=="HTML"){
otest.insertBefore(newNode,otest.childNodes[i]);
}
}
</script>
</body>
</html>
