public function add()
{
    //获取数据
    $navMenuModel = new NavMenuModel();
    $intNavId     = $this->request->param("nav_id");
    $intParentId  = $this->request->param("parent_id");
    $objResult    = $navMenuModel->where("nav_id", $intNavId)->order(["list_order" => "ASC"])->select();
    $arrResult    = $objResult ? $objResult->toArray() : [];

    //调用树型类
    $tree       = new Tree();
    $tree->icon = [' │ ', ' ├─ ', ' └─ '];
    $tree->nbsp = ' ';
    $array      = [];

    foreach ($arrResult as $r) {  str_manage,是用在导航菜单之后菜单的各种操作，添加菜单的时候就没必要这个了。估计是从上段代码里黏贴的。
        $r['str_manage'] = '<a href="' . url("NavMenu/add", ["parent_id" => $r['id']]) . '">添加子菜单</a>
                            | <a href="' . url("NavMenu/edit", ["id" => $r['id']]) . '">编辑</a>
                            | <a class="J_ajax_del" href="' . url("NavMenu/delete", ["id" => $r['id']]) . '">删除</a> ';      
        $r['status']     = $r['status'] ? "显示" : "隐藏";
        $r['selected']   = $r['id'] == $intParentId ? "selected" : "";
        $array[]         = $r;
    }

    $tree->init($array);
    $str      = "<option value='\$id' \$selected>\$spacer\$name</option>";
    $navTrees = $tree->getTree(0, $str);
    $this->assign("nav_trees", $navTrees);



    $navs = $navMenuModel->selectNavs();
    $this->assign('navs', $navs);

    $this->assign("nav_id", $intNavId);
    return $this->fetch();



}

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