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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.1. The registerForm.onsubmit function is relatively large, and the code contains many if statements;项羽思虑道：亚父是说……刘邦会成为关中王？刘邦前程远大，不过这关中王……哼哼。　　该剧围绕贺氏集团CEO贺乔宴和儿童心理咨询师秦以悦展开，讲述了理性冷漠的霸总和柔软细致的心理医生，由相识到相爱的故事。徐文长怀着同样的目光望向了他的眼前：就像绍兴第一才子，成为教书先生一样。在2018腾讯视频v视界大会中，公布《使徒行者3》明年回归，使徒行者2官方微博发布一条微博《使徒行者3》继续寻找黑暗中的英雄。