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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.她用敬佩的口气道：班昭在《女诫》第二章就点明了一个前提条件：夫不能不贤，夫也在不停修身养性，然后才有下面教女子的内容。不如就在这条街东头逛，那儿有个旧古物市场，都是些有来历的旧物。路桥川（武雨泽 饰）、钟白（徐晓璐 饰）和任逸帆（于翔 饰）是高中时代的好友，彼此之间感情十分要好，三人共同考入了同一所大学，展开了属于他们的多姿多彩的大学生活。在学校里，钟白和路桥川结识了海洋（庞瀚辰 饰）、十三（应岱臻 饰）、一心（桑砚 饰）等好友，与此同时，钟白从高中一直延续到现在的对于路桥川的暗恋亦愈演愈烈。本剧展现亲情的温暖、家庭的珍贵与坚韧乐观的生命态度，呈现台湾家庭浓烈而独特的情感特色。讲述 80 年代台湾歌舞团员的故事。The above code: We use a parameter FN to pass it in, and if there is an instance of result, we will return it directly. Otherwise, the current getInstance function calls FN, and this pointer points to this FN function. After that, the return is saved in the result. Now we can pass a function in, whether it is to create div or iframe. In short, if this is the case, we can use getInstance to get their instance objects.丞相，这也不可以。