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没等上面再回话，四五十骑已然掉头，缓缓逼近倭寇。For example, if we want to implement a JS function, Such as form validation, Then if we don't use the policy pattern in javascript described in the previous chapter to solve the form validation encapsulation code, It is a temporary form validation function written by itself. Certainly without any encapsulation, Then at this time, we will pop up a prompt to the user for whether the two values are equal. If there is a form verification on another page, their judgment method and business logic are basically the same, but the comparison parameters are different. Should we consider writing a form verification code again? So now we can consider using the template method pattern to solve this problem. Common methods are extracted, and different methods are implemented by specific subclasses. This design code also has the advantages of stronger scalability and better code ~这几日，京城真是怪事不断。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.这话昨天以及今天堂审前玉米都听过了，那时候，他毫不犹豫地相信。Lightness mode. The parameters that determine the generated color include: the hue and saturation of the bottom color and the brightness of the top color. The effect of this mode is just the opposite of Color mode, which mixes with the lower color according to the brightness distribution of the upper color.杨长帆好生劝道，不管谁要你们来的，你们放心，我今晚便去谈，明天包没事，行个方便……话罢他又冲凤海摆手：凤海，拿两个平安铃给军爷。