https://www.notedome.com/wp-content/themes/notedome/js/jquery-multitabs.js

1(function($) {
2  $.fn.multitabs = function() {
3    var _this = $(this);
4    var tabs = _this.children('.tab__header[data-child="false"]').children('div');
5    var childrenTabs = _this.find('.tab__header[data-child="true"]').children('div');
6
7    $(tabs).add(childrenTabs).on('click', function() {
8      var num;
9      var _this = $(this);
10      var classNameTab = _this.attr('class').split(' ');
11      var classNameContent = _this.parent().siblings().children();
12
13      for (i = 0; i <= classNameTab.length; i++) {
14        if (/([\d.]+)/.test(classNameTab[i])) {
15          var isChild = $(_this).parent().data('child');
16          num = classNameTab[i].split('-')[1];
17          
18          if (!isChild) {
19            $(tabs).removeClass('tab__header--active');
20            $(_this).addClass('tab__header--active');
21          } else {
22            $(_this).siblings().removeClass('tab__header--active');
23            $(_this).addClass('tab__header--active');
24          }
25
26        }
27      }
28
29      $(classNameContent).each(function(i, n) {
30        var name = $(n).attr('class').split(' ');
31        for (n = 0; n <= name.length; n++) {
32          if (name[n] != undefined) {
33            if (/([\d.]+)/.test(name[n])) {
34              if (num === name[n].split('-')[1]) {
35                var el = $(classNameContent)[num - 1];
36                $(classNameContent).removeClass('tab__content--active');
37                $(el).addClass('tab__content--active');
38              }
39            }
40          }
41        }
42      });
43
44    });
45
46  }
47})(jQuery);