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Jquery

function toggleMenu() {
    $('.toggle_menu_button').click(function(e) {
        e.preventDefault();
        $(this).closest('.has_sub_menu').find('.toggle_menu').first().slideToggle(100);
        $(this).toggleClass('open');
    });
}

Pure JS

const el = document.getElementById('menu');
const className = 'active';

const toggleClass = () => {
  if (el.classList) {
    el.classList.toggle(className);
  } else {
    const classes = el.className.split(' ');
    const existingIndex = classes.indexOf(className);

    if (existingIndex >= 0) {
      classes.splice(existingIndex, 1);
    } else {
      classes.push(className);
    }

    el.className = classes.join(' ');
  }
};

document.getElementById('menu-toggle').addEventListener(
  'click',
  () => { toggleClass(); },
  false,
);

document.getElementById('menu-close').addEventListener(
  'click',
  () => { toggleClass(); },
  false,
);