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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.Injections, straight run, fartThis strategy is mainly implemented by imposing rate limits on scarce resources such as IP and accounts. A typical example of this rate limit is to require the user to resolve the verification code to verify whether he publishes too frequently, as shown above.略微的犹豫之后又放弃了，毕竟自己只是猜测，未必正确。In this process, there will be some physical, behavioral and psychological changes. Although these changes are not necessarily, they are often signs that life is coming to an end.一个月黑风高的夜晚，一辆破车里坐着三个面色凝重的男士…我们有信念，不顾个人安危，解救了屠宰场待宰的几十条狗命。我们有追求，不顾个人利益，顺利在“弯”的投资方眼下溜走，还解救了投资方欲潜规则的娱记。我们有理想，不顾个人荣辱，卧薪尝胆只因为我们坚信是金子总会发光。我们发誓。这一切都是套路！我们本意深藏功与名，在这芸芸众生中做一个普通人…奈何光芒太耀眼，即便只是星星，也是最亮的三颗。111. X.X.2