class Jago_Deal_IndexController extends Mage_Core_Controller_Front_Action
{
    public function ajaxAction()
    {

        $block = $this->getLayout()->createBlock('deal/list')->setTemplate('persistent/customer/form/login.phtml');
        $this->getResponse()->setBody($block->toHtml());

    }
} 

public function setDealStatus($dealStatus)
    {
        $this->dealStatus = $dealStatus;
    }

 　　　　　　$block = $this->getLayout()->createBlock('deal/list');
           $block  ->setDealStatus( ‘hello’);
           $this->getResponse()->setBody($block->toHtml());

$this->dealStatus