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What's the conclusionBasketballFrom 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:唐王沉迷五行星象之术，册封道人天机子为国师，天机子却在进京途中遇刺身亡。这一案件牵出了当朝相国和江湖组织“天网宗”两大势力和一场篡位夺权的巨大阴谋。靳胜男、罗重楼等英雄侠士将如何力挽狂澜惩奸除恶？Increased Rewards: Although rarely discussed, many new attacks are driven by attack media and become very profitable. A recent example of this kind of behavior is the rise of abuse of cloud services such as Google Cloud to mine encrypted digital cash in response to the soaring price of bitcoin at the end of 2017.V-grooves must be opened between the splicing boards. The V-grooves should be opened from both sides of the PCB. Under normal circumstances, the V-grooves should be opened by 1/3 on both sides of the PCB, i.e. If the thickness of the board is 1.6 mm, the depth of the V-grooves on both sides of the board should be 0.53 mm;;