Павел Корнилов

const baseWidth = $('.banner').width();

$(window).scroll(function() {
  $('.banner').width(baseWidth + $(this).scrollTop());
});

document.addEventListener('click', function(e) {
  if (!e.target.closest('.tileset-showitems')) {
    tilesetShowListRemove();
  }
});

- .active {
+ .active .box {

const containerSelector = '.tileset-showitems';
const buttonSelector = `${containerSelector} .tileset-showitems-trigger`;
const activeClass = 'active';
const closeAllExcept = container => document
  .querySelectorAll(`${containerSelector}.${activeClass}`)
  .forEach(n => n !== container && n.classList.remove(activeClass));

document.addEventListener('click', ({ target: t }) => {
  const button = t.closest(buttonSelector);
  const container = t.closest(containerSelector);

  if (button) {
    container.classList.toggle(activeClass);
  }

  closeAllExcept(container);
});

window.addEventListener('keydown', e => e.key === 'Escape' && closeAllExcept());

$('#popup-item').not('.done').addClass('popup-open done');

var timerId = setInterval(function() {
  $.get('someUrl',function(data){
         console.log(data);
   });
}, 2000);

$('.js-md-catalog-open').on("click", function() {
	$("viewport").attr("content", "width=device-width, initial-scale=1.0, user-scalable=no");
});
$(".js-overlay").on("click", function() {
	$("viewport").attr("content", "width=device-width, initial-scale=1.0");
});

.images_box a {
  display: none;
}

.images_box a.active {
  display: inline;
}

const containerSelector = '.items-list-item-wrapper';
const buttonSelector = '.items-list-item-colors input';
const contentSelector = '.images_box a';
const activeClass = 'active';


// jquery, как вы и хотели
$(containerSelector).on('change', buttonSelector, function(e) {
  $(contentSelector, e.delegateTarget)
    .removeClass(activeClass)
    .eq($(buttonSelector, e.delegateTarget).index(this))
    .addClass(activeClass);
}).each((i, n) => $(buttonSelector, n).first().click());

// или, к чёрту jquery
document.querySelectorAll(containerSelector).forEach(n => {
  n.addEventListener('change', onChange);
  n.querySelector(buttonSelector).click();
});

function onChange({ target: t }) {
  if (t.matches(buttonSelector)) {
    const buttons = this.querySelectorAll(buttonSelector);
    const index = Array.prototype.indexOf.call(buttons, t);
    this.querySelectorAll(contentSelector).forEach((n, i) => {
      n.classList.toggle(activeClass, i === index);
    });
  }
}