$("#jstree").on("loaded.jstree", function (event, data) {
    var n = 0;
    var root = data.instance.get_node(event.target.firstChild.firstChild.lastChild);
    var nodes = root.children_d;
    for (var i in nodes) {
        var node = data.instance.get_node(nodes[i]);
        if (node.state.mType == "user") {
            data.instance.set_icon(node, 'fa fa-user');//需要下載Font Awesome圖示庫
            n ++;
        }
    }
    if (n == 0){
        layer.msg("沒有找到節點");
    }
    data.instance.open_node(root.id);// 展開根節點
});