我正在为 firebase 做一个演示，想在我们的数据库中添加一个用户 + 在我们的数据库中添加一个包含更多用户信息的部分。数据库目前没有安全规则，因为它是一个演示，没有存储任何重要信息。每当我点击网页上的提交按钮时，我都会收到此错误：

FIREBASE 致命错误：

Can't determine Firebase Database URL. Be sure to include databaseURL option when calling firebase.intializeApp().

HTML（在 body 标签中）：

<div>
        <h1>SIGNUP ///(88w88)\\\</h1>
        <input id = "emailS">EMAIL</input>  
        <input id = "passwordS">PASSWORD</input>
        <input id = "name">NAME</input>
        <input id = "phone">PHONE</input>
        <input id = "color">FAVORITE COLOR</input>
        <button id = "submit" onclick = "submitSignUp()">SUBMIT</button>
</div>

<script src="https://www.gstatic.com/firebasejs/7.24.0/firebase-app.js"></script>
    <script src="https://www.gstatic.com/firebasejs/4.8.1/firebase.js"></script>

    <script>
      // Your web app's Firebase configuration
      var firebaseConfig = {
        apiKey: "AIzaSyAOw4BCZhBpKQ1HTaqRXbzj7kFFzviL61Q",
        authDomain: "fir-demo-ca0f5.firebaseapp.com",
        projectId: "fir-demo-ca0f5",
        storageBucket: "fir-demo-ca0f5.appspot.com",
        messagingSenderId: "390968592171",
        appId: "1:390968592171:web:b5856c31026ac491b4e76e"
      };
      // Initialize Firebase
      firebase.initializeApp(firebaseConfig);
    </script>
    
    <script src = "FirebaseDemoB.js"></script>

JS：- 应该发生的是，注册一个用户，我们将一个全局变量设置为 true，表示用户已注册。一旦他们登录，使用 onStateChanged，我们会检查他们是否已注册（未登录），并从表单中获取信息并将其写入数据库。实际上，我得到了上面提到的错误

var signedUp = false;

function submitSignUp()
{
    console.log("FIREBASE");
    var email2 = document.getElementById("emailS").value;
    var password = document.getElementById("passwordS").value;
    
    console.log(email2 + " " + password);
    
    firebase.auth().createUserWithEmailAndPassword(email2, password)
      .then((userCredential) => {
        // Signed in 
        user = userCredential.user;
        signedUp = true;
        // ...
      })
      .catch((error) => {
        var errorCode = error.code;
        var errorMessage = error.message;
        // ..
      });
}

function writeUserData(userId, name, phone, color)
{
    firebase.database().ref('users/' + userId).set({
        name: name,
        phone: phone,
        color : color
      });
}

firebase.auth().onAuthStateChanged((user) => {
  if (user) {
    if(signedUp)
    {
        var name = document.getElementById("name").value;
        var phone = document.getElementById("phone").value;
        var color = document.getElementById("color").value;
        writeUserData(user.uid, name, phone, color);
        
    }
    // ...
  } else {
    console.log("HELLOTHERE");
  }
});