signup.js

let form = document.querySelector('#form');
  var firebaseConfig = {
    apiKey: "AIzaSyBFkmspKoi-RDOMZfL-k9__70YIaS7vLn0",
    authDomain: "notedemo-a1e15.firebaseapp.com",
    projectId: "notedemo-a1e15",
    storageBucket: "notedemo-a1e15.appspot.com",
    messagingSenderId: "641128485554",
    appId: "1:641128485554:web:db3794ada96d08b1ea2fab"
  };
  // Initialize Firebase
  firebase.initializeApp(firebaseConfig);
  firebase.analytics();

  const auth = firebase.auth();

  form.addEventListener('submit', function (e) {
    e.preventDefault();
    let email = form.elements.email.value;
    let password = form.elements.password.value;

    auth.createUserWithEmailAndPassword(email, password)
        .then(cred => {
            form.reset();
            window.alert("Successfully Registered");
            window.location.href = "index.html";
        })
        .catch(err => {
            alert(err.message);
        })
});