通过WooCommerce中的挂钩更改产品税种

Question

我应该创建一个函数来根据由3rd part插件实现的字段和帐单所在国家/地区取消税款，但是此代码不起作用。我在stackoverflow上尝试了其他解决方案，但没有任何效果。我的代码有什么问题？我也尝试了这段代码，但没有尝试Link

add_filter('woocommerce_product_get_tax_class', 'switch_product_tax_class', 100, 2 );
add_filter('woocommerce_product_variation_get_tax_class', 'switch_product_tax_class', 100, 2 );
function switch_product_tax_class( $tax_class, $product ){
    if( isset($_COOKIE["setTaxes"]) && $_COOKIE["setTaxes"] == 'no' ){
        return "zero-rate";
    }
    return $tax_class;
}

add_action('wp_footer', 'payment_methods_trigger_update_checkout');
function payment_methods_trigger_update_checkout(){
    ?>
    <script type="text/javascript">
    jQuery(function($){
        $(document).on('change','#billing_country',function(){
            b_type = $("#billing_invoice_type :selected").val();
            b_country = $("#billing_country :selected").val();
            countryList = ['AT','LV','BE','LT','BG','LU','CZ','MT','CY','NL','HR','PL','DK','PT','EE','RO','FI','SK','FR','SI','DE','GR','SE','IE','HU'];
            if (b_type == "invoice"){
              if($.inArray(b_country, countryList) != -1){
                console.log(b_type);
                console.log(b_country);
                document.cookie = "setTaxes=no";
                $(document.body).trigger("update_checkout");
              }else{
                  document.cookie = "setTaxes=yes";
                  $(document.body).trigger("update_checkout");
              }
            }else{
              document.cookie = "setTaxes=yes";
              $(document.body).trigger("update_checkout");
            }
            
        });
    });
    </script>
    <?php
};