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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!JavaScript Module Specification-Introduction to AMD Specification and CMD Specification可惜山崖上陡峭险峻，地方狭窄，根本转不开身子。在这个世界中，江湖永远不死，江湖中出没的大侠们亦不会被人遗忘。珍贵的七星绝杀阵四部经书关系到世界的安危，亦令许多渴望统治世界的不轨之徒们垂涎三尺。为了守护这四部经书，先人成立了东城、西城、南城、北城四所学校，将经书交由四所学校的校长保管。还是老样子。People in the vicinity, receiving praise, getting greetings from friends in the vicinity, and being liked by chance can all increase their charm value. The specific method is to use a beautiful and handsome head portrait + a suitable QQ netizen, so that you can not lose in color value.