https://www.prescrire.org/Portals/_default/skins/prescrire/bootstrapNavMobile/BootStrapNavMobile.js?cdv=2852

1$(document).ready(function (e) {
2    document.querySelector('.second-button').addEventListener('click', function () {
3
4        document.querySelector('.animated-icon2').classList.toggle('open');
5    });
6});
7
8$(document).ready(function () {
9
10    $('ul.nav li.dropdown > a').click(function (e) {
11        var $target = $(e.target);
12        var activeNav = $(this).siblings();
13        if ($target.is('b') || $(this).attr('href') == '#') {
14            // The anchor tag only has one sibling - the submenu it controls
15            $(this).siblings().toggle("fast");
16
17            // Now walk up the parent chain:
18            // - look for other li's (menu items at the same level)
19            // - hide any lower down ul's (submenus) they may have.  Use find else you leave traces of children's child menus.
20            $(this).parentsUntil('ul.nav', 'li').siblings().find('ul').hide();
21            return false;
22        }
23    });
24    document.addEventListener('click', function (event) {
25        $('.dropdown-menu').parentsUntil('ul.nav', 'li').siblings().find('ul').hide();
26        return false;
27    });
28    $(window).scroll(function () {
29        $('.dropdown-menu').hide();
30    });
31    $(document).ready(function () {
32        $('#Body').css('overflow', 'auto');
33        var navMobile = document.getElementById('Body');
34        var styleNavMobile = window.getComputedStyle(navMobile);
35        $('.animated-icon2').click(function (e) {
36            if (styleNavMobile.overflow === 'auto') {
37                e.preventDefault();
38                $('#Body').css('overflow', 'hidden');
39            }
40            else if (styleNavMobile.overflow === 'hidden') {
41                e.preventDefault();
42                $('#Body').css('overflow', 'auto');
43            }
44        });
45    });
46});