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解放战争时期，胶东半岛。风高月黑，山河村区委曲书记和区长全家被潜入的亡命匪徒暗杀，曲妻曹春梅和县敌工部张滔临危受命，分别接任区委书记和区长,誓严查凶手。春梅的妹妹春玲和弟弟到墓前向姐夫默哀。山河村的斗争十分尖锐复杂。匪首汪化堂等人隐藏在芦苇荡中观察着村里的一举一动，暗中联合村中蒋殿人等人，意欲反共翻天。汪匪外甥孙承祖假称在战场上牺牲，潜伏在村里从事破坏活动，其……This chapter is the last lecture on design patterns. It will talk about the third design pattern-behavioral pattern, with a total of 11 types: policy pattern, template method pattern, observer pattern, iterative sub-pattern, responsibility chain pattern, command pattern, memo pattern, state pattern, visitor pattern, intermediary pattern and interpreter pattern. I have been writing about design patterns for a long time. At last it's halfway through, Writing a blog post is a very time-consuming thing, Because I have to be responsible for the readers, Whether it's graphs, codes, or representations, Everyone hopes to write it as clearly as possible so that readers can understand it. I think both I and the readers hope to see high-quality blog posts come out. Starting from myself, I will stick to it and update it continuously. The continuous motivation comes from the continuous support of readers and friends. I will do my best to write every article well! I hope everyone can give opinions and suggestions continuously and jointly create a perfect blog post!若被人欺辱时还顾着文雅姿态，不敢还击，就真真太可笑了。/sit (sit)Usefulness of shooting: shooting is an effective means when hunting (hunting animals); After the arrow hits the oil jug, it can burn around it.发生杂肥猫与三小强身上的的有趣搞笑的故事First of all, let's introduce the business: in the purchase process, you can select the color of the mobile phone and enter the purchase quantity. At the same time, there are two display areas in the page, which respectively display the color and quantity that the user has just selected. There is also a button that dynamically displays the next operation. We need to query the inventory corresponding to the mobile phone of this color. If the inventory quantity is less than the purchase quantity this time, the button will be disabled and the copy with insufficient inventory will be displayed. Otherwise, the button will be highlighted and can be clicked and displayed if the shopping cart is displayed.