https://www.iwanichi.co.jp/wp-content/plugins/wp-favorite-posts/script.js?ver=1.6.8

1jQuery(document).ready( function($) {
2    $('body').on('click', '.wpfp-link', function() {
3        dhis = $(this);
4        wpfp_do_js( dhis, 1 );
5        // for favorite post listing page
6        if (dhis.hasClass('remove-parent')) {
7            dhis.parent("li").fadeOut();
8        }
9        return false;
10    });
11});
12
13function wpfp_do_js( dhis, doAjax ) {
14    loadingImg = dhis.prev();
15    loadingImg.show();
16    beforeImg = dhis.prev().prev();
17    beforeImg.hide();
18    url = document.location.href.split('#')[0];
19    params = dhis.attr('href').replace('?', '') + '&ajax=1';
20    if ( doAjax ) {
21        jQuery.get(url, params, function(data) {
22                dhis.parent().html(data);
23                if(typeof wpfp_after_ajax == 'function') {
24                    wpfp_after_ajax( dhis ); // use this like a wp action.
25                }
26                loadingImg.hide();
27            }
28        );
29    }
30}