我一直在注册页面上工作，我的数据没有存储到数据库中。代码在下面。不存在控制台错误。我已经尝试了很多不同的想法，我只是想存储数据。另外，另一个问题，是否有方法检查数据库中的两个值是否在同一电子邮件下？我想知道这是一个密码系统。能帮帮我吗我真的很沮丧，希望这能奏效。

<button type="button" id="signUpButton" onclick="confirmData() ; stopClicksAgain()">Sign Up!</button>
<script type="module" src="backend/database.js/"><script>

import { initializeApp } from "https://www.gstatic.com/firebasejs/9.22.2/firebase-app.js";
import { getDatabase, ref, set  } from "https://www.gstatic.com/firebasejs/9.22.2/firebase-database.js";

const firebaseConfig = {
  apiKey: "AIzaSyDJdI7Sgr7ZGo3Do6NVswgs1UvjVcQUZbs",
  authDomain: "bakerstoolbox-9ca91.firebaseapp.com",
  databaseURL: "https://bakerstoolbox-9ca91-default-rtdb.firebaseio.com",
  projectId: "bakerstoolbox-9ca91",
  storageBucket: "bakerstoolbox-9ca91.appspot.com",
  messagingSenderId: "175444196196",
  appId: "1:175444196196:web:f6314c643c71315b5f1871"
};

const app = initializeApp(firebaseConfig);
const database = getDatabase(app);

//get user sign up data
var email = document.getElementById("email");
var phone = document.getElementById("phone-number");
var firstName = document.getElementById("firstName");
var lastName = document.getElementById("lastName");

//button functions
const signUpButton = document.getElementById("signUpButton");
signUpButton.addEventListener("click", signUpNewUser);

//sign up a new user
function signUpNewUser(){
    set(ref(database, 'users/'), {
        userEmail : email,
        userPhoneNum : phone,
        userFirstName : firstName,
        userLastName : lastName
    })
    .then(() => {
      console.log("GOOD")
    })
    .catch((error) => {
      console.log("ERROR")
    });
}