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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.那下一次呢？别管下一次了，我更期待小鱼儿、花无缺、铁心兰三人的虐恋，你们说他们最后是如何结局？一提到这段狗血的三角恋，网友们顿时兴奋起来，纷纷发表着自己的看法。Returns the corresponding Dom node若真心对她好，自然能包容体贴。商场大亨乐家的儿子乐言（万梓良 饰）在美国留学期间，因为一起误杀罪被盼入刑七年。2017-02-01 10:35:34There are hundreds of thousands of manuscripts in this article. If you can't see the update in Jinjiang, go in from the last chapter!