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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:一担担的热水抬出来，倒在石板路上，冲得血水到处流。要是先使劲划，到后来就划不动了。· Increased sweating;第3季剧情也将加入人工智慧（AI）等新时代的背景，整体故事再升级。When Xiao Bian first came to Nagoya, he chatted and asked a local person, where is Nagoya more fun?　　霸气归来的苏北一心只想查清真相，在路南帮助下，得以化解心结，重拾初心。二人解开误会，重归于好。