HarmonyOS 鸿蒙Next 为啥updateManager.checkAppUpdate(context)的返回结果一直是0

HarmonyOS 鸿蒙Next 为啥updateManager.checkAppUpdate(context)的返回结果一直是0

private checkUpdateAndShowDialog() {
    let context: common.UIAbilityContext = getContext() as common.UIAbilityContext;
    try {
      updateManager.checkAppUpdate(context)
        .then((checkResult: updateManager.CheckUpdateResult) => {
          Logger.info(TAG, "Succeeded in checking Result updateAvailable:" + checkResult.updateAvailable);
          updateManager.showUpdateDialog(context)
            .then((resultCode: updateManager.ShowUpdateResultCode) => {
              Logger.info(TAG, "Succeeded in showing UpdateDialog resultCode:" + resultCode);
            })
            .catch((error: BusinessError) => {
              Logger.error(TAG, `showUpdateDialog onError.code is ${error.code}, message is ${error.message}`);
            });
        }).catch((error: BusinessError) => {
        Logger.error(TAG, `checkAppUpdate onError.code is ${error.code}, message is ${error.message}`);
      });
    } catch (error) {
      Logger.error(TAG, `checkAppUpdate onError.code is ${error.code}, message is ${error.message}`);
    }
  }