使用AWS Cognito的API进行登录，即在注册后直接调用API进行登录。

示例代码：

import AWS from 'aws-sdk';
import { CognitoUserPool, CognitoUserAttribute, CognitoUser } from 'amazon-cognito-identity-js';
const region = 'us-east-1';
const identityPoolId = 'YOUR_IDENTITY_POOL_ID';

// 在邀请注册策略下注册并直接登录
const signUpAndLogin = async (name, email, password, invite) => {
  // create callback promise
  const callbackPromise = () => {
    return new Promise((resolve, reject) => {
      const cognitoUserPool = new CognitoUserPool({
        UserPoolId: 'YOUR_USER_POOL_ID',
        ClientId: 'YOUR_APP_CLIENT_ID',
        region: region,
      });
      const attributeList = [
        new CognitoUserAttribute({
          Name: 'custom:invite',
          Value: invite,
        }),
        new CognitoUserAttribute({
          Name: 'email',
          Value: email,
        }),
        new CognitoUserAttribute({
          Name: 'name',
          Value: name,
        }),
      ];

      cognitoUserPool.signUp(email, password, attributeList, null, (err) => {
        if (err) {
          reject(err);
        }
        resolve();
      });
    });
  };

  await callbackPromise();

  // login after sign up
  const getIdToken = () => {
    return new Promise((resolve, reject) => {
      AWS.config.region = region;
      AWS.config.credentials = new AWS.CognitoIdentityCredentials({
        IdentityPoolId: identityPoolId,
      });
      const cognitoUser = new CognitoUser({
        Username: email,
        Pool: new CognitoUserPool({
          UserPoolId: 'YOUR_USER_POOL_ID',
          ClientId: 'YOUR_APP_CLIENT_ID',
          region: region,
        }),
      });
      const authenticationDetails = new AuthenticationDetails({
        Username: email,
        Password: password,
      });
      cognitoUser.authenticateUser(authenticationDetails, {
        onSuccess: function (result) {
          resolve(result.getIdToken().getJwtToken());
        },
        onFailure: