为 WooCommerce 外部商品添加“在新标签页打开”功能

// add custom button to shop page add_filter('woocommerce_loop_add_to_cart_link', 'shop_page_open_external_in_new_window', 10, 2);  function shop_page_open_external_in_new_window($link) {     global $product;     if ($product->is_type('external')) {         $link = sprintf(             '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s" target="_blank">%s</a>',             esc_url($product->add_to_cart_url()),             esc_attr(isset($quantity) ? $quantity : 1),             esc_attr($product->get_id()),             esc_attr($product->get_sku()),             esc_attr(isset($class) ? $class : 'button product_type_external'),             esc_html($product->add_to_cart_text())         );     }      return $link; }

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// remove default button on product page remove_action('woocommerce_external_add_to_cart', 'woocommerce_external_add_to_cart', 30);  // add custom button on product page add_action('woocommerce_external_add_to_cart', 'product_page_open_external_in_new_window', 30);  function product_page_open_external_in_new_window() {     global $product;     if (!$product->add_to_cart_url()) {         return;     }      $product_url = $product->add_to_cart_url();     $button_text = $product->single_add_to_cart_text();      do_action('woocommerce_before_add_to_cart_button'); ?>     <p class="cart">         <a href="<?php echo esc_url($product_url); ?>" rel="nofollow" class="single_add_to_cart_button button alt" target="_blank">             <?php echo esc_html($button_text); ?>         </a>     </p> <?php     do_action('woocommerce_after_add_to_cart_button'); }