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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:作为美国第16任总统，林肯曾经立下卓越功勋。本片主要根据普利策获奖得主、历史学家Doris Kearns Goodwin的著作《对手团队：政治天才林肯》（Team of Rivals: The Political Genius of Abraham Lincoln）改编而成，该书描写了林肯政治团队“四虎将”总检察长Edward Bates、国务卿William H. Seward、战争部长Edwin M. Stanton、财政部长Salmon P. Chase眼中的林肯，这些人都曾是林肯竞选总统时的竞争者，但后来被林肯强大的人格魅力所感召，成为他的得力干将。故事围绕着南北战争展开，在那段艰难的日子里，面对种种压力，林肯和他的团队运筹帷幄，最终打赢了这场战争，统一了美国。洪霖似有所觉，收回目光，盯了葫芦好半响，再未出声，跳下马背，将缰绳撂与随从，他自大步上山回书院去了。为了粉碎日军在山东的侵略阴谋，八路军组建了以营长黄鸣锋为队长的利剑特遣队，就在黄鸣锋执行任务时，找到了失踪的苏五巧，更有兰如剑、穆雪飞和柳迎春加入，利剑特遣队又壮大了起来。他们炸掉了日军的武器库，摧毁了日军一次又一次对共产党的武装围剿，炸沉了运送实验化学制剂的太和号货船。就在大家为完成任务松了口气的时候，黄鸣锋接到了上级总部传来的消息，日本军官杉木已将一批实验化学试剂运走，估计三天后将运抵前线。黄鸣锋立即率队员出发，他们劫持了一辆日军卡车，日夜兼程追赶杉木。黄鸣锋最终以自己的生命为代价，完成了任务。