我嘗試實現簡單的密碼驗證，但以下功能似乎不起作用，它們甚至沒有顯示在控制臺中。我是否缺少一些非常簡單的東西？"user strict";window.onload = init;function init() {    document.getElementById("newPassword").onkeydown = checkPassword;    document.getElementById("confirmPassword").onkeydown = checkConfirm;}function checkPassword(event){    let newPass = document.getElementById("newPassword").value;    var passwordRegex = new RegExp("^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*&])[A-Za-z\d]@$!%*?&]{8,}$")    if(!passwordRegex.test(newPass)){        feedback.innerHTML = "'"+newPass + "' is not secure."        let result = passwordRegex.test(newpass);        console.log("result: " + result);        return false;    }    return true;}function checkConfirm(event) {    let confirmPass = document.getElementById("confirmPassword").value;    let newPass = document.getElement("newPassword").value;    if(newPass != confirmPassword)) {        feedback.innerHTML = "Password does not match.";            return false;    }    return true;}let feedback - document.getElementById("feedback");function newUserRequest() {}function checkUser() {    let email = document.getElementById(emailUser).value;    let password = document.getElementById("passwordUser").value;}<div class="itemsFormDisplay">    <label class="detailNames">Password</label><br>    <input id="newPassword" class="detailsFields" type="password" name="password" required></div><div class="itemsFormDisplay">    <label class="detailNames">ConfirmPassword</label><br>    <input id="confirmPassword" class="detailsFields" type="password" name="password" required></div>