Ext.onReady(function(){
var tree = new Ext.tree.TreePanel({
el:'tree'
});
var root = new Ext.tree.TreeNode({text:'我是根'});
tree.setRootNode(root);
tree.render();
});本来想显示一个根节点的，结果报错：Ext.tree.TreeNode is not a constructor
[在此错误处中断] var root = new Ext.tree.TreeNode({text:'我是根'});
这是什么原因呢？？这个是深入浅出ext2版上的例子，不知道为什么到我这边就死活都报这个错！不知道哪位见过这个？
<div id="tree" style="height:300px;"></div>
你把下面的代码都拷贝到你的页面里试试
<html>
<head>
<title>test</title>
<link rel="stylesheet" type="text/css" href="ExtJS/resources/css/ext-all.css" />
<script type="text/javascript" src="ExtJS/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="ExtJS/ext-all.js"></script>
</head>
<body>
<!-- <div id="treeDiv"></div>-->
<div id="tree" style="width:100px; height:200px;"></div>
</body>
<script type="text/javascript">
Ext.BLANK_IMAGE_URL = 'ExtJS/s.gif';
Ext.onReady(function () {
var tree = new Ext.tree.TreePanel({
el: 'tree'
}); var root = new Ext.tree.TreeNode({ text: '我是根' }); tree.setRootNode(root);
tree.render();
}); //ExtGrid.render('grid');
</script>
</html>