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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.这人嘴大眼圆脸方，表情猥琐贱格，一看就不是什么正经人。2. The coupling between the publisher and the subscriber is reduced. The publisher only publishes a message, and it does not care how the message is used by the subscriber. At the same time, the subscriber only monitors the event name of the publisher. As long as the event name of the publisher remains unchanged, it does not care how the publisher changes. Similarly, the seller (publisher) only needs to tell the subscriber (buyer) about the arrival of shoes, regardless of whether the buyer buys or not, or whether he buys other sellers. As long as the shoes arrive, the subscriber can be notified.五个犯了罪的女人和一个憎恨犯罪的女狱警，当本该水火不容的双方心意相通之时，她们开始了针对一个男人的复仇。然而，复仇之路充满了意外。本剧通过描写在残酷的环境中恣意生活的女人，来表现羁绊、友情以及活着的意义，是一部前所未有的犯罪喜剧。[功夫][卧虎藏龙]金牌监制崔宝珠携顶级班底打造武侠巨片。4. After completing the selection stage, the players will immediately enter the preparation stage in the game scene. This stage cannot cause damage to other players. All players will be distributed in multiple areas in the scene. In this stage, the players can know in advance and discuss with their teammates the tactics and strategies of the birth selection stage.