WordPress woocommerce 添加立即购买按钮

/*添加buy Now*/

add_action('woocommerce_after_add_to_cart_button', 'add_content_after_addtocart' );
add_action('woocommerce_after_add_to_cart_form', 'buy_Now_submit_form');
add_filter('woocommerce_add_to_cart_redirect', 'redirect_to_checkout');


function add_content_after_addtocart() {
    // get the current post/product ID
    $current_product_id = get_the_ID();
    // get the product based on the ID
    $product = wc_get_product( $current_product_id );
    // get the "Checkout Page" URL
    //$checkout_url = wc_get_checkout_url();

    if (in_array($product->get_type(), ['simple', 'variable'])) {
        $buy_Now_button = '<button type="submit" style="clear:both;margin-top:10px;width:100%;height:45px;" name="add-to-cart" class="single_add_to_cart_button button alt" value="' . $current_product_id .'" id="buy_Now_button">ซื้อทันที </button>
                           <input type="hidden" name="is_buy_Now" id="is_buy_Now" value="0" />
                          ';
        echo $buy_Now_button;
    }
}

/**
 * 控制跳转
 */
function buy_Now_submit_form() {
    ?>
    <script>
        jQuery(document).ready(function(){
            // listen if someone clicks 'Buy Now' button
            jQuery('#buy_Now_button').click(function(){
                // set value to 1
                jQuery('#is_buy_Now').val('1');
                //submit the form
                jQuery('form.cart').submit();
            });
        });
    </script>
    <?PHP
}

/**
 * 商品加入购物车后，返回要跳转的地址
 * @param $redirect_url
 * @return string
 */
function redirect_to_checkout($redirect_url) {
    if (isset($_REQUEST['is_buy_Now']) && $_REQUEST['is_buy_Now']) {
        $redirect_url = wc_get_checkout_url();
    }

    return $redirect_url;
}

在主题functions.PHP中加入以上代码