final public static function js(array $params)
    {
        return ("<script type='text/javascript' src='".
            FEnv::get("host.web.components.apps").strtolower(FEnv::get("framework.env"))."/".
            strtolower(FEnv::get("app.call"))."/".
            ((isset($params['path']))? $params['path']."." : "")."js'></script>");
    }