https://jsfiddle.net/mashmvb9/ [menuButton, menuButtonText].forEach(function(item, i, arr) {
item.addEventListener('click', function (e) {
menuButton.classList.toggle('is-active');
e.preventDefault();
});
}); Su EcmaScript 6: for (let element of [menuButton, menuButtonText]) {
element.onclick = e => {
menuButton.classList.toggle('is-active');
e.preventDefault();
}
}