文件：dzz\system\notification.php

例如：我想每一秒都检查是否有新通知，就需要修改​'timeout'=>​后的数字为​'timeout'=>1*1000​，单位是秒

elseif($filter=='checknew'){//检查有没有新通知
    $num=DB::result_first("select COUNT(*) from %t where new>0 and uid=%d",array('notification',$_G['uid']));
    exit(json_encode(array('sum'=>$num,'timeout'=>1*1000)));
}