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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.　　另一方面，苏与刚从外国回来之朱茵茵及在妓寨当琵琶仔之妙珠，发展一段纠缠不清的感情。期间，苏更与省城恶霸金多宝交恶，遭受连番逼害，更连累鸿及众宝芝林弟子。与此同时，当日与苏结怨之太监亦上门找他算账，苏四面受敌，究竟能否化险为夷呢？他的三角恋情又如何解决呢？我小葱也跟大人似的，当家理事都能来得。1938年秋，淞沪会战后的上海，烽火连天，民不聊生。在日本军国主义的罪恶铁蹄下，既是公共租界中央巡捕房的探长又是上海滩铁血人物“刀锋”的华明翰，带领民间抗日组织“华兴社”的义士们奋起抗日。在破案追凶的过程中，他们发现日军一个个惊天阴谋，顿时杀机四伏，悬疑密布。华兴社众人一边身负惩恶除暴的要职，一边肩负捍卫国家和民族大义的重任，与上海各路抗日力量并肩战斗；在夺回藏有侵华战略要图及巨额黄金藏宝图的“龟鹤献寿钟”的过程中，与侵略者斗智斗勇、不畏牺牲。在情感与理智、个人生死与民族存亡的抉择面前，他们做出正确而艰难的选择，历经磨难，坚定地打击日军侵略阴谋的野心、粉碎敌人掠夺黄金财富的企图 。Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:随着《绝代双骄》越来越精彩，《武侠世界》杂志的销量不断攀升。