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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:Are all the 8 pins of port P0 in open drain mode, or are several of them?From Asteraceae of Compositae. This is also a very useful subject! Please remember it! Famous plants of this family include:燕南天就是这样的大侠。《六龙飞天》为韩国SBS于2015年10月12日起播出的月火连续剧，由申景秀导演，金荣昡、朴尚渊编剧。该剧主要讲述了以朝鲜铁血君主李芳远为中心的六个主要人物的野心和成功故事的写实主义史剧 。山芋急忙道：就用石头剪刀布。