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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.Invoker.action ();　　该剧讲述了一个未来女神经历时空穿梭救赎自己以及所爱的人，和一群充满青春活力的学生在WJC精英学院发生的错综复杂的感人故事。Bad reviews, the update is too slow, and it broke before entering the state.《你和我的警察课堂》是讲述比军队更残酷、比牢房更坚固的警察大学的年轻人们波澜壮阔的青春成长罗曼史电视剧。现在在京城，呃，怀念以前的日子，照说回乡下很容易吧？可是一样难……我总不能丢下家人自己跑回清南村或者虎王寨。日寇占领下的青岛，日军绝密的“真空地带计划”正在展开。替人顶罪的洪涛发觉自己的家人已经在反日行动的风口浪尖，毅然越狱，临时替代四弟结婚，伺机行刺大汉奸。然而身为警察的三弟克洋却处处为难越狱的洪涛。洪涛一家卷入了一场巨大的战争阴谋之中。洪涛迫不得已假冒抗日领袖“烈火”，又在一夜之间蒙冤成为汉奸。面对爱人的枪口，兄弟的追捕，洪涛展现出过人的胆识和手段，在各方势力的追逐下游刃有余。随着真相的一步步揭露，家仇国恨交织在一起，成长为抗日英雄的洪涛率领地下游击队最终彻底破坏了日军的“真空地带计划”。