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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:　　这是护宝与夺宝的故事。当弱小的盾面对强大的矛，会怎样？电视剧《杜鹃山》讲述的是在秋收起义的巨大影响下，湘赣边界杜鹃山，有一支农民自卫军揭竿而起，三起三落，濒于覆灭。农民自卫军领袖雷刚急盼找到中国共产党人，为他们找到出路。1928年春，共产党组织派柯湘前来与他们联系。柯湘途中被捕，农民自卫军在刑场上营救了她。柯湘把农民自卫军改编成为自卫军，用无产阶级建军思想对部队进行改造。期间他们与地主武装头子毒蛇胆斗志斗勇，经历无数波折，终于，自卫军会合红军主力，消灭了敌人，正式改编为工农革命军。开赴井冈山，去与毛委员领导的红军主力会师。贪财且不靠谱的汽车修理工于果突然接到机场地勤人员李三妹的电话，告知他有位名叫夏小白的美国乘客需其前往接机，多年前作为交流生赴美期间的那次艳遇因此再现脑海。兴奋不已的于果赶到机场，不料眼前出现的竟是个七岁的男孩。孩子自称是夏小白的儿子，名叫夏天，因为妈妈在车祸中不幸去世，他决定独自来找“超级英雄”——爸爸于果。惊慌失措之际，于果冲着李三妹一通发飙，拂袖而去。李三妹因夏天的滞留而被领导斥责，正在抓狂之际，三妹突然接到孩子舅舅泰勒的越洋电话，得悉对方正在赶往中国的途中，并受托暂时照顾夏天。从天而降的“儿子”让于果的生活发生了大地震，女友姗姗的哭闹、父亲的斥责，让他焦头烂额，和夏天的相处更是让他不知所措。在于果手忙脚乱之际，众好友纷纷为他出谋划策。然而，夏天下定决心要跟随于果生活，令泰勒和于果都大感意外。泰勒表面尊重夏天的选择，背地里却和于果达成“交易”……让你哥哥带些回来给你吃，也是一样的。便问道：那你此举是何意？不管是因为什么，岂能拿性命当儿戏？黄豆猛一拍手掌，赞道：大人此言有理。