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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.眼珠一转，他招来两个护卫，吩咐他们换上便服，跟上大苞谷，看他在何处落脚。Filter target users. Through the recommended content, tell the user whether to "welcome" or "refuse". It's just like when you look at the front page of Eye Quick Hands and say that you don't like such content, Quick Hands say that I don't want you, and my target users like it.之前在大堂上，他本来是一时气愤冲动才说了那样的话。Ma Junwei Spokesman: 300,000 RMB per year Jiang Tao Spokesman: 300,000 RMB every two years周围众军高呼响应。