在我的 Shopify 网站的产品详细信息页面上，当您单击“ 添加到购物车 ”时，该页面使用 AJAX 来执行其操作。但是有一个名为 cart.item_count 的变量，除非页面刷新，否则不会更新。

问题： 如何让 AJAX 更新该页面上的 cart.item_count 。

以下是 HTML 页面的代码：

        <div id="mini-cart" >

            <span class="cart_count_info">Cart ({{ cart.item_count }})</span>//THIS SPAN IS WHAT NEEDS TO BE UPDATED 

        </div>

         <p id="add-to-cart-msg"></p> //THIS "P" IS UPDATED BY THE AJAX WITH MESSAGING SEE BELOW JAVASCRIPT

          <form action="/cart/add" method="post" class="variants" id="product-actions" enctype="multipart/form-data">
              //TOOK OUT SOME OF THE FORM DATA THAT IS NOT NEED FOR THIS EXAMPLE

          </form>

JavaScript 代码。 底部有一行代码可更新同一页面上的一些副本...如果我可以更新已在页面上找到的 cart.item_count 变量。

function addToCartSuccess (jqXHR, textStatus, errorThrown){

  $.ajax({
    type: 'GET',
    url: '/cart.js',
    async: false,
    cache: false,
    dataType: 'json',
    success: updateCartDesc
  });
  $('#add-to-cart-msg').hide().addClass('success').html('Item added to cart! <a href="/cart" title="view cart">View cart and check out &raquo;</a>').fadeIn();

$('span#cart_count_info').load(Cart ({{ cart.item_count }})); 
//MAYBE HERE IS WHERE I CAN ADD MY CODE TO UPDATE THE VARIABLE I NEED. MY CODE IS JUST A GUESS SINCE ID DON'T DO MUCH JAVASCRIPT PROGRAMMING.


}