如何使用Firebase持久化保持页面刷新后的用户登录

<!-- 引入Firebase SDK -->
<script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-auth.js"></script>

<!-- 初始化Firebase -->
<script>
  var firebaseConfig = {
    // 从Firebase控制台获取配置信息
    apiKey: "YOUR_API_KEY",
    authDomain: "YOUR_AUTH_DOMAIN",
    projectId: "YOUR_PROJECT_ID",
    storageBucket: "YOUR_STORAGE_BUCKET",
    messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
    appId: "YOUR_APP_ID"
  };
  firebase.initializeApp(firebaseConfig);
</script>

firebase.auth().createUserWithEmailAndPassword(email, password)
  .then((userCredential) => {
    // 注册成功
    var user = userCredential.user;
    console.log(user);
  })
  .catch((error) => {
    // 注册失败，处理错误
    var errorCode = error.code;
    var errorMessage = error.message;
    console.error(errorCode, errorMessage);
  });

firebase.auth().signInWithEmailAndPassword(email, password)
  .then((userCredential) => {
    // 登录成功
    var user = userCredential.user;
    console.log(user);
  })
  .catch((error) => {
    // 登录失败，处理错误
    var errorCode = error.code;
    var errorMessage = error.message;
    console.error(errorCode, errorMessage);
  });

firebase.auth().onAuthStateChanged((user) => {
  if (user) {
    // 用户已登录
    console.log(user);
  } else {
    // 用户已注销或未登录
    console.log("User is signed out.");
  }
});

firebase.auth().signOut().then(() => {
  // 用户已注销
}).catch((error) => {
  // 注销失败，处理错误
  console.error(error);
});