/**
* (void) actionTree : 树
* @param string $id
* @param $user_id 用户ID
*/
public function actionTree($id = '@', $user_id)
{
$model = new MapUnit();
if ($id == '#') {
$id = '@';
}
$data = $model->getChildren($id, $user_id);
Yii::$app->response->format = Response::FORMAT_JSON;
echo json_encode($data);
}