https://www.yamaguchi-clinic.jp/wp-content/plugins/xo-event-calendar/js/ajax.js?ver=2.1.2

1jQuery(function ($) {
2  xo_event_calendar_month = function (e, month, event, categories, holidays, prev, next, start_of_week, months, navigation) {
3    var id = $(e).parents('.xo-event-calendar').attr('id');
4    var target = $('#' + id);
5    target.prop('disabled', true);
6    target.addClass('xoec-loading');
7    $.ajax({
8      type: 'POST',
9      url: xo_event_calendar_object.ajax_url,
10      data: {
11        'action': xo_event_calendar_object.action,
12        'id': id,
13        'month': month,
14        'event': event,
15        'categories': categories,
16        'holidays': holidays,
17        'prev': prev,
18        'next': next,
19        'start_of_week': start_of_week,
20        'months': months,
21        'navigation': navigation
22      },
23      datatype: 'html',
24      success: function (response) {
25        target.removeClass('xoec-loading');
26        target.find(".xo-months").html(response);
27      },
28      error: function () {
29      }
30    });
31    return false;
32  };
33});