public static function registerMap($map)
    {
        $maps = (array) $map;
        array_walk($maps, function (&$name) {
            $name = 'js/' . $name . '.js';
        });
        static::$_mapJsFiles = array_unique(array_merge(static::$_mapJsFiles, $maps));
        if (static::$_mapJsFiles) {
            MapAsset::register(Yii::$app->getView())->js = static::$_mapJsFiles;
        }
    }