public static function sAdd($key, $value)
 {
     $data = FileHandler::getFileContent(self::DATA_FILE());
     if ($data) {
         $dataarray = json_decode($data, true);
     } else {
         echo '读取data.dat文件失败';
         exit;
     }
     $dataarray[$key][] = $value;
     $dataarray[$key] = array_unique($dataarray[$key]);
     FileHandler::putFileContent(self::DATA_FILE(), json_encode($dataarray));
     return true;
 }