无法访问节点的属性

Question

我在调用自定义菜单项的函数中。为什么node.attr（'id'）或$（node）.attr（'id'）不起作用？

树初始化：

$("div#treeView").jstree({
    plugins: ["themes", "ui", "json_data", "crrm", "contextmenu"],
    themes: { "icons": false },
    "json_data": jsondata, 
    contextmenu: { items: customMenu, select_node: true }
});

node.attr（'type'）返回undefined：

function customMenu(node) {
    // The default set of all items
    var items = {
        deleteItem: { // The "delete" menu item
            label: "Delete",
            action: function () { alert("delete"); }
        }
    };

    if (node.attr('type') == "report") delete items.deleteItem;

    return items;
}

这是我向树添加节点时的结构：

CreateTreeNode: function (id, title, type, metadata) {
    var newNode = {
        "data":
        {
            "title": title,
            "attr":
            {
                "id": id,
                "type": type
            }
        },
        "metadata": (metadata == undefined ? {} : metadata),
        "children": []
    };
    return newNode;
}