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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.Anyway, the landlord's sugar content is so high, and there are also cars. Is sweet abuse half?Action: Stupid Force原来，郑氏想着这一回来乡下，到底跟京城不同。Gets the response's event listener and the Dom binds to the generated event object.PS: In order to facilitate everyone to see my update in time, I have set up a public number. In the future, the article will be published simultaneously with the public number and the blog park, so that everyone can receive the notice in time. If you don't understand any questions, you can also leave a message on the public number, so that I can see and reply in time. (The public number has just started to be done, and it is relatively rough. There is nothing in it = =, and it will be gradually improved in the later period ~ ~)