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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.比如清南村的少年，来找板栗葫芦看结果。? Generally speaking, design patterns are divided into three categories:再晚些时，他就没有机会走了。Panshan Park is located on the north side of Jinpan Section of Jiangbin North Road in the urban area, with a total area of about 70 mu. It is the only riverside mountain park in Quanzhou. It is equipped with leisure tea kiosks, children's amusement parks, basketball courts and other facilities and equipment. It is equivalent to a natural fitness and leisure club, where you can climb mountains and drink tea for sightseeing.　　Natalie Martinez饰演Theresa Murphy警探，她爱嘲弄﹑自信﹑来自警察世家﹑从不怕质疑权威，因此她被一直各警局上司嫌弃，并被丢弃到混乱的13警...Are also asynchronous loading modules, AMD executes the module after it has been loaded, After all modules are loaded and executed, they will enter the callback function and execute the main logic. The effect is that the execution sequence and writing sequence of the dependent modules are not necessarily consistent. Depending on the network speed, which is downloaded first and which is executed first, but the main logic must be executed only after all dependent loading is completed. ?