const userinfo = () => { // Trim -- remove spaces username = document.getElementById("username").value.trim(); email = document.getElementById("email").value.trim(); password = document.getElementById("password").value.trim(); confirmpassword = document.getElementById("confirmpassword").value.trim(); console.log(username, email, password, confirmpassword); };

const checkinput = () => { // Not Null if ( username.trim().length !== 0 && email.trim().length !== 0 && password.trim().length !== 0 && confirmpassword.trim().length !== 0 ) { return true; } else { // Style Java // Element.style.typeof style(Border, Size, Font, Color) msgPassword.style.border = "2px solid red"; msgConfirm.style.border = "2px solid red"; document.getElementById("error-allength").innerHTML = "place fill all filed "; return false; } };

我希望这个条件能够用于填写验证表单的输入，我认为这是不可能解决的问题，请帮帮我！