magento How to get all associated children product of a configurable product

get associated productIds(获取configurable product关联的simple product id):

$childIds = Mage::getModel('catalog/product_type_configurable')->getChildrenIds($_product->getId());

get associated products(获取configurable product 关联的simple product):

$childProducts = Mage::getModel('catalog/product_type_configurable')->getUsedProducts(null,$_product);