我有一个版本为4.7.6的网站，并对当前版本的4.8.3进行了更新。更新之后，我注意到ajax调用不起作用。当我查看页面并转到网络时，我看到了关于管理ajax的绿色长条。php，如图所示。

为该特定页面读取的php文件代码如下所示：

<?php
/**
* The template used for displaying List of tours of category
*
* @package WordPress
* @subpackage Twenty_Sixteen
* @since Twenty Sixteen 1.0
*/
?>
<?php

$limit = get_field(\'tour_per_page\', \'option\');

$queried_object = get_queried_object();

$title_color = \'\';
if ($queried_object->taxonomy):
    $taxonomy = $queried_object->taxonomy;
    $cat_title = $queried_object->name;
    $term_id = $queried_object->term_id;

    $parents = get_category_parents($term_id);
    $parent = explode(\'/\', $parents);
    $parent_term = get_term_by(\'slug\', $parent[0], \'tour_category\');

    $color = get_field(\'category_color\', $taxonomy . \'_\' . $parent_term->term_id);
//    $color = get_field(\'category_color\', $taxonomy . \'_\' . $term_id);
    $banner = get_field(\'category_banner\', $taxonomy . \'_\' . $parent_term->term_id);
    $cat_image = get_field(\'category_image\', $taxonomy . \'_\' . $term_id);

    $rgba1 = hex2rgba($color, 1);
    $rgba2 = hex2rgba($color, 0.7);

    $title_color = ($rgba2) ? \'background:\' . $rgba2 . \';\' : \'\';
endif;
$style = \'\';
if ($banner):
    $style = "background:url(\'" . $banner . "\'); background-position: 50% 50% ; background-size: cover;";
endif;
?>
<!-- top banner -->
<div class="inner-banner-wrap africa-banner" style="<?php echo $style; ?>">
    <div class="container">
        <div class="row">
            <div class="col-xs-12">
                <div class="inner-banner-text">
                    <?php if ($cat_title): ?>
                        <div class="banner-title" style="<?php echo $title_color; ?>">
                            <?php if ($cat_image): ?>
                                <span><img src="<?php echo $cat_image; ?>" alt="africa-map"></span>
                                <?php
                            endif;
                            echo $cat_title;
                            ?>
                        </div>
                    <?php endif; ?>
                </div>
            </div>
        </div>
    </div>
</div>
<!-- end top banner -->

<!-- Bread Crumb Menu Start-->
<div class="container">
    <?php get_template_part(\'template-parts/content\', \'breadcrumb\'); ?>


</div>
<!-- Bread Crumb Menu End-->


<div class="travel-event-wrap blog-wrap travel-listing-wrap">

    <div class="container">
        <div class="row">
            <!-- Start Sidebar-->
            <div class="col-xs-12 col-md-3">
                <div class="filter-list-section" id="filter-list-section"><ul></ul></div>
                <div class="side-bar-wrap">
                    <?php dynamic_sidebar(\'search_tour\'); ?>
                </div>
            </div>
            <!-- End Sidebar -->
            <?php
            // only run this on category pages
            $this_cat = &get_category($wp_query->get_queried_object_id());
            $count = $this_cat->count;
            ?>
            <!-- Tour List Section Start-->
            <div class="col-xs-12 col-md-9">
                <div class="desc-block">
                    <h1 style="color:<?php echo $rgba1; ?>"><?php echo $this_cat->name; ?></h1>
                    <p><?php echo category_description($this_cat->term_id); ?></p>
                </div>

                <div class="filter-bar clearfix">
                    <div class="event-number pull-left">
                        <span></span> rundresor tillgängliga
                    </div>
                    <?php dynamic_sidebar(\'sort_tour\'); ?>
                </div>


                <div id="event-list-wrap" class="event-list-wrap"></div>
                <!-- Tour List Section End-->

                <input type="hidden" id="limitstart" value="0"/>
                <input type="hidden" id="limit" value="<?php echo $limit; ?>"/>
                <input type="hidden" id="totaltour" value="<?php echo $count; ?>"/>
                <div id="loadmore" class="text-center" style="display: none;"><img
                        src="<?php echo get_template_directory_uri() . "/images/loading.gif"; ?>"></div>
            </div>
        </div>
    </div>
</div>
<script>
    var xhr;
    jQuery(document).ready(function () {
        jQuery(\'#loadmore\').show();
        loaddata();
        if (navigator.userAgent.indexOf(\'MSIE\') !== -1 || navigator.appVersion.indexOf(\'Trident/\') > 0) {
            jQuery(\'body\').scroll(function () {            
               if( (jQuery(\'body\').scrollTop() + jQuery(\'body\').height()) >= ( jQuery(document).height()    - jQuery("#footer_div").height()  ) )
               {
                    var limitstart = jQuery(\'#limitstart\').val();
                    var totaltour = jQuery(\'#totaltour\').val();
                    if (parseInt(limitstart) < parseInt(totaltour)) {
                        jQuery(\'#loadmore\').show();
                        loaddata();
                    } else {
                        jQuery(\'#loadmore\').hide();
                    }
                }
            });
        }else{
            jQuery(window).scroll(function () {
               if( (jQuery(window).scrollTop() + jQuery(window).height()) >= ( jQuery(document).height()    - jQuery("#footer_div").height()  ) )
               {
                    var limitstart = jQuery(\'#limitstart\').val();
                    var totaltour = jQuery(\'#totaltour\').val();
                    if (parseInt(limitstart) < parseInt(totaltour)) {
                        jQuery(\'#loadmore\').show();
                        loaddata();
                    } else {
                        jQuery(\'#loadmore\').hide();
                    }
                }
            });
        }
    });

    function loaddata() {
        var formSort = jQuery(\'#sortTour\').serialize();
        var formSearch = jQuery(\'#searchTour\').serialize();
        var ajaxurl = \'<?php echo admin_url(\'admin-ajax.php\'); ?>\';
        var limitstart = jQuery(\'#limitstart\').val();
        var limit = jQuery(\'#limit\').val();
        var data = {
            \'action\': \'filter_tour\',
            \'formSort\': formSort,
            \'formSearch\': formSearch,
            \'limitstart\': limitstart
        };
        if (xhr && xhr.readyState != 4 && xhr.readyState != 0) {
            xhr.abort();
        }
        xhr = jQuery.post(ajaxurl, data, function (response) {
            jQuery(\'.bakdrop\').hide();
            jQuery(\'.loader\').hide();
            var data = JSON.parse(response);
            jQuery(\'#event-list-wrap\').append(data.html);
            jQuery(\'#totaltour\').val(data.total_tour);
            jQuery(\'.event-number span\').html(data.total_tour);
            limitstart = parseInt(limitstart) + parseInt(limit);
            jQuery(\'#limitstart\').val(limitstart);
            jQuery(\'#loadmore\').hide();
        });
    }
</script>

我最初认为这是因为javascript代码不在单独的js文件中，并且已排队，所以我这样做了，但没有什么不同。

ajax调用有什么问题吗？希望你能帮忙。