magento 在block部分

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layout/checkout.xml

<checkout_onepage_paymentmethod>
        <remove name="right"/>
        <remove name="left"/>

        <block type="checkout/onepage_payment_methods" name="root" output="toHtml" template="checkout/onepage/payment/methods.phtml">
            <action method="setMethodFormTemplate"><method>purchaseorder</method><template>payment/form/purchaseorder.phtml</template></action>
        </block>
    </checkout_onepage_paymentmethod>

在 block端，输出该部分的html，可以使用下面的代码输出

protected function _getPaymentMethodsHtml()
    {
        $layout = $this->getLayout();
        $update = $layout->getUpdate();
        $update->load('checkout_onepage_paymentmethod');
        $layout->generateXml();
        $layout->generateBlocks();
        $output = $layout->getOutput();
        return $output;
    }