//将用户浏览过的商品保存到session里，可以在浏览记录里显示
        
        $_SESSION['recent_products'][] =$id;
        $_SESSION['recent_products']=array_unique($_SESSION['recent_products']);
        $recentgoods=array();
        foreach ($_SESSION['recent_products'] as $k=>$v){
            if(Db::table('sp_goods')->where('id',$v)->field('sm_thumb,goods_name,id,shop_price')->find()){
                $recentgoods[]=Db::table('sp_goods')->where('id',$v)->field('sm_thumb,goods_name,id,shop_price')->find();
            }

        }
        $this->assign('recentgoods',$recentgoods);