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《幸福保卫战》海报(3张)一天凌晨，她站到窗边，突然看到了一个熟悉的身影……HTTP requests typically have two characteristics: the IP address and the User Agent field. For example, malicious requests are all sent from an IP segment, so just seal the IP segment. Alternatively, their User Agent field has a feature (containing a specific word), then intercept the request with that word.该剧讲述了一个殡仪馆化妆师平凡且温情的一生，力求展现普通百姓家庭的真实生活，面对苦难时的隐忍、挑战与坚持。导演高希希从一个特殊的视角出发，将入殓师这个特殊的职业搬上中国电视剧荧屏。想起家族归顺越王的决定，徐彤心中七上八下的现在看来这一切似乎都因为自己破坏了。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.只是眼下的形势该如何处理呢？无法确定是敌是友，当真是有些麻烦。