见风使帆（見風使帆）　

◎ 见风使帆 jiànfēng-shǐfān

[trim one’s sails;sail with the wind;see how the gander hops;watch how the cat jumps;go with the crowd;sail with the current (stream,tide,times)] 根据风向使用帆位。比喻见机而行,灵活变通

别事见风使帆,再作道理。——《官场现形记》