woocommerce如何隐藏/显示product meta

remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_meta', 40 );

add_action( 'woocommerce_single_product_summary', 'ytkah_show_sku_again_single_product', 40 );
function ytkah_show_sku_again_single_product() {
   global $product;
   <div class="product_meta">
   <?php if ( wc_product_sku_enabled() && ( $product->get_sku() || $product->is_type( 'variable' ) ) ) : ?>
      <span class="sku_wrapper"><?php esc_html_e( 'SKU:', 'woocommerce' ); ?> <span class="sku"><?php echo ( $sku = $product->get_sku() ) ? $sku : esc_html__( 'N/A', 'woocommerce' ); ?></span></span>
   <?php endif; ?>
}

add_action( 'woocommerce_single_product_summary', 'ytkah_show_cats_again_single_product', 40 );
function ytkah_show_cats_again_single_product() {
   global $product;
   <div class="product_meta">
   <?php echo wc_get_product_category_list( $product->get_id(), ', ', '<span class="posted_in">' . _n( 'Category:', 'Categories:', count( $product->get_category_ids() ), 'woocommerce' ) . ' ', '</span>' ); ?> 
}

add_action( 'woocommerce_single_product_summary', 'ytkah_show_tags_again_single_product', 40 );
function ytkah_show_tags_again_single_product() {
   global $product;