AWS Cognito是一种用于身份验证和用户管理的服务。以下是解决AWS Cognito登录问题的示例代码：

1. 创建一个Cognito用户池:

const AWS = require('aws-sdk');

AWS.config.update({
  region: 'your-region',
  accessKeyId: 'your-access-key',
  secretAccessKey: 'your-secret-access-key'
});

const cognitoIdentityServiceProvider = new AWS.CognitoIdentityServiceProvider();

const createUserPool = async () => {
  const params = {
    PoolName: 'your-pool-name',
    AutoVerifiedAttributes: ['email'],
    Policies: {
      PasswordPolicy: {
        MinimumLength: 8,
        RequireLowercase: true,
        RequireNumbers: true,
        RequireSymbols: true,
        RequireUppercase: true
      }
    },
    Schema: [
      {
        Name: 'email',
        AttributeDataType: 'String',
        Mutable: true,
        Required: true
      },
      {
        Name: 'phone_number',
        AttributeDataType: 'String',
        Mutable: true,
        Required: true
      }
    ]
  };

  const result = await cognitoIdentityServiceProvider.createUserPool(params).promise();
  console.log('User pool created:', result.UserPool.Id);
};

createUserPool();

2. 创建一个Cognito用户:

const createUser = async () => {
  const params = {
    UserPoolId: 'your-user-pool-id',
    Username: 'your-username',
    TemporaryPassword: 'your-temporary-password',
    MessageAction: 'SUPPRESS',
    UserAttributes: [
      {
        Name: 'email',
        Value: 'your-email'
      },
      {
        Name: 'phone_number',
        Value: 'your-phone-number'
      }
    ]
  };

  const result = await cognitoIdentityServiceProvider.adminCreateUser(params).promise();
  console.log('User created:', result.User);
};

createUser();

3. 使用Cognito进行身份验证:

const authenticateUser = async () => {
  const params = {
    AuthFlow: 'USER_PASSWORD_AUTH',
    ClientId: 'your-client-id',
    AuthParameters: {
      USERNAME: 'your-username',
      PASSWORD: 'your-password'
    }
  };

  const result = await cognitoIdentityServiceProvider.initiateAuth(params).promise();
  console.log('Authentication result:', result.AuthenticationResult);
};

authenticateUser();

这些示例代码展示了如何创建用户池、创建用户和进行身份验证。根据你的实际需求，你可能需要调整代码中的参数和逻辑。