如何使用Firebase Auth API发送邮件验证，并在登录前检查用户是否通过验证

// 引入Firebase Auth SDK
import { initializeApp } from "firebase/app";
import { getAuth, createUserWithEmailAndPassword, sendEmailVerification, signInWithEmailAndPassword } from "firebase/auth";

// 初始化Firebase应用
const firebaseConfig = {
  // Firebase配置信息
};

const app = initializeApp(firebaseConfig);
const auth = getAuth(app);

// 注册新用户
const registerUser = (email, password) => {
  createUserWithEmailAndPassword(auth, email, password)
    .then((userCredential) => {
      // 发送验证电子邮件
      sendEmailVerification(auth.currentUser)
        .then(() => {
          console.log("验证电子邮件已发送");
        })
        .catch((error) => {
          console.log("发送验证电子邮件时出错：", error);
        });
    })
    .catch((error) => {
      console.log("注册用户时出错：", error);
    });
};

// 登录用户并检查验证状态
const loginUser = (email, password) => {
  signInWithEmailAndPassword(auth, email, password)
    .then((userCredential) => {
      const user = userCredential.user;
      if (user.emailVerified) {
        console.log("用户已通过电子邮件验证");
        // 执行登录后的操作
      } else {
        console.log("用户尚未通过电子邮件验证");
      }
    })
    .catch((error) => {
      console.log("登录用户时出错：", error);
    });
};

// 调用注册用户函数
registerUser("user@example.com", "password");

// 调用登录用户函数
loginUser("user@example.com", "password");