https://www.thailandtravel.or.jp/wp-content/plugins/wp-favorite-posts-tat/wpfp.js?ver=4.8.3

1jQuery(document).ready( function($) {
2    $('.wpfp-link').on('click', 'live', 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    parentClass = dhis.parent().attr('class');
19    changeImg = dhis.parent();
20    url = document.location.href.split('#')[0];
21    params = dhis.attr('href').replace('?', '') + '&ajax=1';
22    if ( doAjax ) {
23        jQuery.get(url, params, function(data) {
24                //dhis.parent().html(data);
25                if(typeof wpfp_after_ajax == 'function') {
26                    wpfp_after_ajax( dhis ); // use this like a wp action.
27                }
28                loadingImg.hide();
29			    //console.log(parentClass);
30			    if (parentClass.indexOf('wpfp-remove') != -1) {
31				    changeImg.removeClass('wpfp-remove');
32				    changeImg.addClass('wpfp-keep');
33				    dhis.attr('href',dhis.attr('href').replace(/wpfpaction=remove/g,'wpfpaction=add'));
34			    } else if (parentClass.indexOf('wpfp-keep') != -1) {
35				    changeImg.removeClass('wpfp-keep');
36				    changeImg.addClass('wpfp-remove');
37				    dhis.attr('href',dhis.attr('href').replace(/wpfpaction=add/g,'wpfpaction=remove'));
38			    }
39            }
40        );
41    }
42}