Ajaxを使用してWooCommerceヘッダーカートのアイテム数を動的に更新する方法?

<code class="html"><?php 
$items_count = WC()->cart->get_cart_contents_count(); 
?>
<div id="mini-cart-count"><?php echo $items_count ? $items_count : ' '; ?></div></code>

<code class="php">add_filter( 'woocommerce_add_to_cart_fragments', 'wc_refresh_mini_cart_count');
function wc_refresh_mini_cart_count($fragments){
    ob_start();
    $items_count = WC()->cart->get_cart_contents_count();
    ?>
    <div id="mini-cart-count"><?php echo $items_count ? $items_count : ' '; ?></div>
    <?php
        $fragments['#mini-cart-count'] = ob_get_clean();
    return $fragments;
}</code>

<code class="javascript">$(document.body).trigger('wc_fragment_refresh');</code>

<code class="javascript">$(document.body).trigger('wc_fragments_refreshed');</code>