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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:《火星异种》讲述了在21世纪中期，人类为了让火星变得更加适合居住，将用来改良环境的藻类以及适应性很强的蟑螂投放到了火星上。可是没想到这些生物却拥有了智慧，并且对人类展开了反击。本片讲述卡特里娜飓风期间，在美国新奥尔良州的第九区低地发生的一宗抢劫案。不知道是何方神圣，看架子来头不小，局长将珍藏多年的普洱奉献出来热情款待，那是金明敲诈了很久都没能干成的。.......一群大律师、事务律师和他们的徒弟为捍卫法治精神、巩固司法制度、维护市民的公义、平等，一直坚守岗位，克服种种的挑战及困难。一班律政界新血，在接触形形色色的棘手案件时，体会到人性的本质、对梦想的迷茫。这些艰苦的人生历练，令他们更加明白平等、公义的真正意义。反正明天之后，我们就不是江湖人。