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The following is the definition of the factory method: an interface is defined to create an object, but the subclass decides which one to create. The factory method defers this process of creating objects to subclasses.颂贤在片中演失忆的西夏王子李元昊，失忆时被小怜（万绮雯）收留，俩人倾心相爱，后元昊恢复记忆，性格大变，一心要一统山河，在他与杨家将抢珍珠旗的过程中，小怜因为不愿看他在错下去，把重要物事交给了杨宗保，元昊十分恼怒，小怜亦因为觉得对不起他而在他面前自尽而亡，元昊大痛，抛下万里山河，抱着小怜说是去看雪，最后俩人一起死在雪地上，化为雪人。For example, if you use Word to make a test paper, a test paper is usually divided into two or three columns, and the page number should be displayed under each column.From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code:The Spirit of Zodiac-RabbitCW已续订《圣女简恩》第三季。记得把饺子面活好了。