const buttonSelector = '.added';
const itemSelector = '.added-block';
const activeClass = '_active';
const notActiveSelector = `${itemSelector}:not(.${activeClass})`;
const newActiveCount = 2;
document.addEventListener('click', e => {
const button = e.target.closest(buttonSelector);
if (button) {
const items = [...button.parentNode.querySelectorAll(notActiveSelector)];
items.slice(0, newActiveCount).forEach(n => n.classList.add(activeClass));
button.disabled = items.length <= newActiveCount;
}
});