Flutter 具体数字转k计

  ///将34123转成3.4k
getUsefulCount(int usefulCount) {
    double a = usefulCount / 1000;
    if (a < 1.0) {
      return usefulCount;
    } else {
      return '${a.toStringAsFixed(1)}k'; //保留一位小数
    }
  }