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Iptables are more complicated and I am not very good at using them. It has certain influence on server performance and cannot prevent large-scale attacks.The events before x=3, well understood, are case 2.未来某时，一种丑陋凶恶、仿佛来自地狱的怪物肆虐人间，大肆屠杀人类。某小镇在怪物的荼毒下宛如一座死城，生存者战战兢兢，惶恐度日。京城中被人津津乐道的两户皇亲国戚，一户是被冰人们竞相拉红线的护国大将军、靖安侯尹思慎，另一户是无人敢问津的“女张飞”廉王郡主叶蓉儿。谁知一道圣旨赐婚，两个不曾谋面的人被定了姻缘。叶蓉儿连尹思慎的面都没见到便带着贴身女官闻人翎连夜逃婚，找机会和离。叶蓉儿决定自己成为特级一品媒，自己为自己和离。于是她化名闻人静，与闻人翎装作姐妹开了家名为薄情馆的冰人馆，专接和离拆婚案，打尽天下薄情男。机缘巧合下，陆廷霄和方仙寻都加入了薄情馆。叶蓉儿发现两人接近她好似都带着不为人知的目的，更令她意外的是，她逃婚的“夫君”尹思慎似乎就隐藏在两人中间......我那个被大哥送给黄瓜哥哥了。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.