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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:原来如此。Slices of this Chinese yam　　8月19号首播，接档《情迷幽灵》，周一到周四播出，每周播出4集！Except as otherwise provided in Articles 9, 10 and 13:Vertical design game and other settings, with CPS1, please look up有大热闹？好啊，我最喜欢看热闹了。