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出了溶洞，山中吹来和风，含着春日特有的清甜和青草树叶气息，虽然与桃花谷差不多，板栗他们却觉得到了另一个世界。没啥带不起的，杀人该给银子给银子，别拖着，一拖他们就急了。222. X.X.121When I heard this, I coughed gently and motioned for his words to be a bit off the topic. Wang Zeduan was embarrassed at first. Looking at his expression, he did feel that what he said had nothing to do with the topic, but then he smiled and didn't care, but went on to say: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.Follow-up: No follow-up, attack power is immediately determined according to the character attribute and monster defense when added.　　身在美国宾夕法尼亚州的藏獒专家卓木强巴突然收到一个陌生人送来的信封，装着两张照片，惊现的远古神兽，促使卓木强巴及导师、世界犬类学专家方新教授亲赴西藏，发现照片上的动物竟然和帕巴拉神庙有关……