Extjs加载本地的一个json文件

<head>
    <title></title>
    <link href="../Styles/Extjs/resources/css/ext-all.css" rel="stylesheet" type="text/css" />
    <script src="../Styles/Extjs/adapter/ext/ext-base.js" type="text/javascript"></script>
    <script src="../Styles/Extjs/extjs/ext-all-debug.js" type="text/javascript"></script>
    <script type="text/javascript">
        var tree = new Ext.tree.TreePanel({
            animate: true,
            renderTo: Ext.getBody(),
            rootVisible: true,
            autoScroll: true,
            autoHeight: true,
            lines: true,
            300,
            loader: new Ext.tree.TreeLoader({
            preloadChildren: true,
            clearOnLoad: false,
             dataUrl: 'data.json'
            }),
            root: new Ext.tree.AsyncTreeNode({
                text: 'Extjs',
                id: 'root',
                expanded: false
            }),
            collapseFirst: false
        });


    </script>
</head>
<body>
</body>
</html>

在json文件中添加自己的想要加载的树节点类似：[
   {'text':'not leaf',children:[{'text':'is leaf',leaf:true}]},
    {'text':'is leaf',leaf:true}
]

有时候加载的时候提示http 405 错误这个可能与版本的问题

有很多梦想是遥不可及的，除非你坚持