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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:　　郑建强到机场接了一位酒店的客人，来自美国的华人郭毅然老先生，开车带其去香山某敬老院看望他的“老战友”，这才知道其实去看的正是自己患有老年痴呆症的岳母。临近目的地的盘山路上，因躲避急转弯道后冲出的一辆切诺基而翻下山坡，老先生重伤进了罗晓红所在的医院急救，郑建强也负了重伤。事后才得知，驾驶切诺基的恰恰就是老先生的女儿郭琳琳！这时，王陆的心已经提到嗓子了，刀客当真能无情的挥出这一刀，了结东方不败，了结他的宿命？锵。巍子、秦岚全力携手拯救“红色危情”，著名导演罗雷继《成都往事》之后又一倾情力作……该剧讲述了一位干练律师在被告知患上了早发型阿尔茨海默症后，赌上自己的人生奋勇迎战，直到最后一刻都想要维护自己的尊严的故事。"Then when you shot these 'dogs' with guns, how many shots did you need on average to kill one?" I asked.翘儿双臂抱着膝盖，喃喃道：可四方男儿，有几个能得善终。