关于tree加载的问题，急求解决

$("#tree" + e.menu_code).tree({
    data: data,
    lines: false,
    animate: true,
    onBeforeExpand: function (node, param) {
        $("#tree" + e.menu_code).tree('options').url = "./json/menu/menu_" + node.id + ".json";
    },
    onClick: function (node) {
        if (node.url) {
            /*if(typeof node.attributes != "object") {
             node.attributes = $.parseJSON(node.attributes);
             }*/
            addTab(node);
        } else {
            if (node.state == "closed") {
                $("#tree" + e.menu_code).tree('expand', node.target);
            } else if (node.state == 'open') {
                $("#tree" + e.menu_code).tree('collapse', node.target);
            }
        }
    }
});