1，module.json5文件中咨察，聲明權限

    "requestPermissions": [
     
      {
        "name": "ohos.permission.ACCESS_BIOMETRIC",
        // 生物認證
        "reason": "BIOMETRIC_REQUEST_REASON",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when": "inuse"
        }
      },
    ],

2，檢查設備是否支持生物認證

//是否支持指紋登陸
try {
      userAuth.getAvailableStatus(userAuth.UserAuthType.FINGERPRINT, userAuth.AuthTrustLevel.ATL2);
      return 0
    } catch (error) {
      const err: BusinessError = error as BusinessError;
      return err.code
    }
//是否支持面紋登錄（2D）
try {
      userAuth.getAvailableStatus(userAuth.UserAuthType.FACE, userAuth.AuthTrustLevel.ATL2);
      return 0
    } catch (error) {
      const err: BusinessError = error as BusinessError;
      return err.code
    }

檢查結果判斷：

userAuth.UserAuthResultCode.TYPE_NOT_SUPPORT //不支持
userAuth.UserAuthResultCode.NOT_ENROLLED//支持但未設置過福青，引導設置
0 //支持且設置過

3摄狱，引導跳轉到設備系統(tǒng)的生物識別設置頁面

private gotoSystemBioAuthSetPage(){
    let context = getContext(this) as common.UIAbilityContext;
    let want: Want = {
      bundleName: 'com.huawei.hmos.settings',
      abilityName: 'com.huawei.hmos.settings.MainAbility',
      uri: 'biometrics_and_password_settings',
      parameters: {
        pushParams: 'com.example.natificationdemo'
      }
    };
    context.startAbility(want)
  }

4脓诡，生物認證開通

//隨機挑戰(zhàn)值生成
const rand = cryptoFramework.createRandom();
const len: number = 16;
let challenge = rand?.generateRandomSync(len)?.data;
//認證參數(shù)
const authParam: userAuth.AuthParam = {
          challenge: challenge,
          authType: [userAuthType],
          authTrustLevel: userAuth.AuthTrustLevel.ATL2,
 };
//認證提示
const widgetParam: userAuth.WidgetParam = {
          title: '請輕觸指紋傳感器',
};
//開始認證
let userAuthInstance = userAuth.getUserAuthInstance(authParam, widgetParam);
// 需要調用UserAuthInstance的start()接口，啟動認證后媒役，才能通過onResult獲取到認證結果祝谚。
userAuthInstance.on('result', {
      onResult(result) {
      if (result.result == userAuth.UserAuthResultCode.SUCCESS) { 
          //生物認證成功
          resolve(result.token)
      } else {
           resolve(null)
      }
   }
});
userAuthInstance.start()

5，開通權限后酣衷，敏感信息的存儲設計交惯，推薦使用 @ohos.security.asset (關鍵資產存儲服務)-ArkTS API-Asset Store Kit（關鍵資產存儲服務