public function systemConfig()
 {
     $sc = new SystemConfig();
     $workRoot = trim(Input::get('workRoot'));
     //        if (File::isWritable($workRoot)) {
     //            $sc->set(SystemConfig::WORK_ROOT_FIELD, $workRoot);
     //        } else {
     //            return Response::json(array(
     //                'res' => 1,
     //                'errMsg' => 'Work Root目录不可写!',
     //            ));
     //        }
     $sc->set(SystemConfig::WORK_ROOT_FIELD, $workRoot);
     return Response::json(array('res' => 0, 'write' => File::isWritable($workRoot)));
 }