API接口：分页

        // 查询满足要求的总记录数
        $count = M("back")->where($back_map)->count();
 
        $pagecount = ceil($count/10);
        $firstrow = ($page-1)*10;
        $listrow = 10;
 
        $result = M('xxx')->where($back_map)
            ->order('createtime desc')->limit($firstrow.','.$listrow)->select();
 
        if($result){
            $data['page'] = $page;
            $data['recordcount'] = "$count";
            $data['pagecount'] = "$pagecount";
            $data['backlist'] = $result;
 
            $array['status'] = 0;
            $array['responseParameters'] = $data;
            $array['comment'] = '查询成功！';
        }else{
            $array['status'] = 1;
            $array['comment'] = '未查到数据！';
        }