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As a TV narrator, he is the pride of the Golden Patrol and the favorite of the whole fruit. He is also a trustworthy son who continues the police family. He is a clown in the family and serves as a lubricating oil in the family. I am proud of the profession of police, so I feel respect and pride for my father who started from the most basic police officer to become the current police officer. My personality and character are excellent, I have a sense of humor and have the unique pettish skills of the old man. Because I am too persistent, no one can change once I make up my mind.光酒店的小姐们试图找出杀死姊妹的凶手,秘密和谎言也随之浮出水面。轻声问道：子房先生，这项伯和你交情深厚？谨慎是必须的，多嘴问一句张良也不会介意。Combination function is to encapsulate various algorithms into small functions one by one, for example, if level A is used, encapsulate a small function, if level B is used, encapsulate a small function, and so on; The following code: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: