includes/lib_order.php搜索“查看购物车中是否全为免运费商品，若是则把运费赋为零”，将

$sql = 'SELECT count(*) FROM ' . $GLOBALS['ecs']->table('cart') . " WHERE `session_id` = '" . SESS_ID. "' AND `extension_code` != 'package_buy' AND `is_shipping` = 0";

修改为

$sql = 'SELECT count(*) FROM ' . $GLOBALS['ecs']->table('cart') . " WHERE `session_id` = '" . SESS_ID. "' AND `extension_code` != 'package_buy' AND `is_shipping` = 1";

再把

$total['shipping_fee'] = ($shipping_count == 0 AND $weight_price['free_shipping'] == 1) ?0 : shipping_fee($shipping_info['shipping_code'],$shipping_info['configure'], $weight_price['weight'], $total['goods_price'], $weight_price['number']);

修改为

$total['shipping_fee'] = ($shipping_count >= 1 AND $weight_price['free_shipping'] == 1) ?0 : shipping_fee($shipping_info['shipping_code'],$shipping_info['configure'], $weight_price['weight'], $total['goods_price'], $weight_price['number']);

即可以实现购物车中只要有一个商品是免邮费的则整个购物车中都免邮。