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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:The above can be use as an extended match condition　　邱有顺(阿翔饰演)，满脑子想捞钱的山寨版达人，他的滑头个性，是否会在军纪如山的新训中心被彻底改变？陈启来到这个世界，带来了新式武侠小说。不等板栗和小葱回答，玉米就气道：不喊你们了。放下秦淼之后，他只觉手脚发软，一阵虚脱。Researchers used standard psychological methods to study the changes in climbers' brains when they analyzed various handles. They first noticed that experienced climbers and novices can identify each handle according to the type of grip they need. For example, in their psychological representation of various handles, all those handles that need to be grasped by wrinkle methods form a group and are distinguished from handles that need to be grasped by other methods. This grouping method is unconscious, just like when you see poodles and Great Dans, you immediately know that they are all members of the canine family, instead of saying to yourself, "Both are dogs."