我为一位客户做了这件事，看起来是这样的：

PHP代码：

<dl class="tree-accordion">
    <?php
    $currentyear = date("Y");
    $years = range($currentyear, 1950);
    foreach($years as $year) { ?>
        <dt><a href=""><i class="fa fa-fw fa-plus-square-o" aria-hidden="true"></i> <?php echo $year; ?></a></dt>
        <?php
        $archi = wp_get_archives(\'echo=0&show_post_count=1&type=monthly&year=\' . $year);
        $archi = explode(\'</li>\', $archi);
        $links = array();
        foreach($archi as $link) {
            $link = str_replace(array(\'<li>\', "\\n", "\\t", "\\s"), \'\' , $link);
            if(\'\' != $link)
                $links[] = $link;
            else
                continue;
        }
        $fliplinks = array_reverse($links);
        if(!empty($fliplinks)) {
            echo \'<dd>\';
            foreach($fliplinks as $link) {
                echo \'<span>\' . $link . \'</span>\';
            }
            echo \'</dd>\';
        } else {
            echo \'<dd class="tree-accordion-empty"></dd>\';
        }
        ?>
    <?php } ?>
</dl>

/*
 * Add filter to query archives by year
 */
function newmarket_getarchives_filter($where, $args) {
    if(isset($args[\'year\'])) {
        $where .= \' AND YEAR(post_date) = \' . intval($args[\'year\']);
    }

    return $where;
}

add_filter(\'getarchives_where\', \'newmarket_getarchives_filter\', 10, 2);

.tree-accordion {
    line-height: 1.5;
}
.tree-accordion dt, .tree-accordion dd {}
.tree-accordion dt a {
    display: block;
}
.tree-accordion .fa {
    color: #666666;
}
.tree-accordion dd a {}
.tree-accordion dd span {
    display: block;
}
.tree-accordion dd {
    margin: 0 0 0 20px;
}

jQuery(document).ready(function(){
    var allPanels = jQuery(\'.tree-accordion > dd\').hide();

    jQuery(\'.tree-accordion > dt > a\').click(function() {
        $target = jQuery(this).parent().next();

        if(!$target.hasClass(\'active\')) {
            allPanels.removeClass(\'active\').slideUp();
            $target.addClass(\'active\').slideDown(100);
        }

        return false;
    });

    jQuery(\'.tree-accordion-empty\').prev().hide();
});

更改此行：

$link = str_replace(array(\'<li>\', "\\n", "\\t", "\\s"), \'\' , $link);

$link = str_replace(array(\'<li>\', "\\n", "\\t", "\\s"), \'\', $link);
$link = str_replace($year, \'\', $link);

“归档”小部件利用wp_get_archives() 给出正确的参数（特别是format 参数），可以提供所需的标记。我想说定制这个小部件是一个很好的开始。