HarmonyOS鸿蒙Next官方示例代码NFC_Tag

HarmonyOS鸿蒙Next官方示例代码NFC_Tag

async function readerModeCb(error: BusinessError, tagInfo: tag.TagInfo) {
  if (!error) {
    if (canIUse('SystemCapability.Communication.NFC.Tag')) {
      if (tagInfo === null || tagInfo === undefined) {
        hilog.error(0x0000, 'testTag', 'readerModeCb tagInfo is invalid');
        return;
      }
      if (tagInfo.uid === null || tagInfo.uid === undefined) {
        hilog.error(0x0000, 'testTag', 'readerModeCb uid is invalid');
        return;
      }
      if (tagInfo.technology === null || tagInfo.technology === undefined || tagInfo.technology.length === 0) {
        hilog.error(0x0000, 'testTag', 'readerModeCb technology is invalid');
        return;
      }
      AppStorage.setOrCreate('tagInfo', tagInfo);

      let nfcA: tag.NfcATag | null = null;
      for (let i = 0; i < tagInfo.technology.length; i++) {
        if (tagInfo.technology[i] === tag.NFC_A) {
          try {
            nfcA = tag.getNfcA(tagInfo); // Get Tag object of NfcA type.
          } catch (error) {
            hilog.error(0x0000, 'testTag', 'readerModeCb getNfcA error = %{public}s', JSON.stringify(error));
            return;
          }
        }
        if (tagInfo.technology[i] === tag.NFC_B) {
          try {
            tag.getNfcB(tagInfo); // Get Tag object of NfcB type.
          } catch (error) {
            hilog.error(0x0000, 'testTag', 'readerModeCb getNfcB error = %{public}s', JSON.stringify(error));
            return;
          }
        }
        if (tagInfo.technology[i] === tag.NFC_F) {
          try {
            tag.getNfcF(tagInfo); // Get Tag object of NfcF type.
          } catch (error) {
            hilog.error(0x0000, 'testTag', 'readerModeCb getNfcF error = %{public}s', JSON.stringify(error));
            return;
          }
        }
        if (tagInfo.technology[i] === tag.NFC_V) {
          try {
            tag.getNfcV(tagInfo); // Get Tag object of NfcV type.
          } catch (error) {
            hilog.error(0x0000, 'testTag', 'readerModeCb getNfcV error = %{public}s', JSON.stringify(error));
            return;
          }
        }
        // Add other technology types.
      }

      if (nfcA === undefined) {
        hilog.error(0x0000, 'testTag', 'readerModeCb getNfcA is invalid');
        return;
      }

      if (nfcA) {
        try {
          nfcA.connect();
        } catch (error) {
          hilog.error(0x0000, 'testTag', 'readerModeCb nfcA.connect() error = %{public}s', JSON.stringify(error));
          return;
        }
        if (!nfcA.isConnected()) {
          hilog.error(0x0000, 'testTag', 'readerModeCb nfcA.connect() false.');
          return;
        }

        let cmdData = [0x01, 0x02, 0x03, 0x04]; // Please change the raw data to be correct.
        try {
          nfcA.transmit(cmdData)
            .then((response: number[]) => {
              hilog.info(0x0000, 'testTag', 'readerModeCb nfcA.transmit() response = %{public}s.',
                JSON.stringify(response));
            })
            .catch((err: BusinessError) => {
              hilog.info(0x0000, 'testTag', 'readerModeCb nfcA.transmit() err = %{public}s.',
                JSON.stringify(err));
              return;
            })
        } catch (error) {
          hilog.info(0x0000, 'testTag', 'readerModeCb nfcA.transmit() error = %{public}s.', JSON.stringify(error));
          return;
        }
      } else {
        hilog.info(0x0000, 'testTag', 'readerModeCb error %{public}s.', JSON.stringify(error));
      }
    }
  }
}

debug走到nfcA.connect();报错，添加打印语句console.log("nfcA对象",JSON.stringify(nfcA));，打印出来nfcA对象 {}。报错信息
hilog.error(0x0000, 'testTag', 'readerModeCb nfcA.connect() error = %{public}s', JSON.stringify(error));------>readerModeCb nfcA.connect() error = {"code":3100201}
怎么解决？才能拿到里面的NfcA,NfcB对象？