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In the strength lifting classroom run by athletes who squat more than 400KG in IPF competition, the first requirement for equipment is that they cannot wear Cushion with cushioning device.View Event Execution ResultsAssault: Liang Qianting, 27,In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.State mode is one of the implementations of state machines, but in a "classless" language like javascript, there is no stipulation that state objects must be created from classes. On the other hand, Java Script can use delegate technology very conveniently without having one object hold another in advance. The following state machine chooses to delegate the request directly to a literal object through the Function.prototype.call method在20世纪90年代的苏格兰，一群天主教学校的女生有机会去爱丁堡参加合唱团比赛，但她们对喝酒、聚会和勾搭更感兴趣，而不是赢得比赛。碧水书院的人则警惕万分。