public function actionDelete()
{
$id = Yii::$app->request->getBodyParam('id');
if ($id == '' || ($model = Group::findOne($id)) === null) {
$this->ajax_return(false, '找不到该数据！');
}
if ($model->delete()) {
$this->ajax_return(true);
} else {
$this->ajax_return(false, '删除失败！');
}
}
