Test code
var credentials = {
login: 'admin',
password: 'qwerty',};
var userLogin;
var userPassword;
function func(){
userLogin = document.getElementById("login").value;
userPassword = document.getElementById("password").value;
if (userLogin === credentials.login && userPassword === credentials.password){
document.getElementById("success").style.display="block";
return false;
}
else {
document.getElementById("wrong").style.display="block";
return false;
}
}
document.getElementById("submit").onclick = func;