这是我的答案，它工作得很好。

function conditionally_remove_checkout_fields( $fields ) {

    // HERE the defined product Categories
    $categories = array(\'age-defying-skincare\',\'az-brand-accessories\',\'az-healthy-supplements\',\'az-other-natural-products\',\'Not available   mwb_wgm_giftcard\',\'little-geniuses-children\');

    $found = false;

    // CHECK CART ITEMS: search for items from our defined product category
    foreach ( WC()->cart->get_cart() as $cart_item ){
        if( has_term( $categories, \'product_cat\', $cart_item[\'product_id\'] ) ) {
            $found = true;
            break;
        }
    }

    // If a special category is in the cart, remove some shipping fields
    if ( $found ) {

        // hide the billing fields
     unset($fields[\'account\'][\'account_password\']);
     unset($fields[\'account\'][\'account_password-2\']);
     unset($fields[\'account\'][\'account_username\']);
     return $fields;

        // hide the additional information section
        add_filter(\'woocommerce_enable_order_notes_field\', \'__return_false\');
        add_filter( \'woocommerce_ship_to_different_address_checked\', \'__return_false\' );
    }
    return $fields;
}