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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:几日前他找上门去，别说爹娘了，就连管家下人都见不着，还被自家兄弟和护卫打了一顿，跪地求饶才肯放走。　　外表平凡的张氏夫妇原来乃昔日戚镇魔界的招魂、夺魄，后改邪归正，欲修成正果，此事被三魔查悉，诱其破戒，奸计得逞后，张氏夫妇回复昔日本色，四处为害民间，钟馗两面受敌屡遇险境；毕竟邪不能胜正，钟终能消灭三魔及二妖，完成天降之大任，成为名垂青史的斩鬼天神。Chang is good. "Zhang Xiaobo said.布成龙（张卫健饰）乃“武林鸿儒”布崇文独孙，自幼父母双亡，由爷爷一手带大，平日爱呼朋引伴，舞文弄墨，毫无忧愁。一日，武林盟主上官一剑（张复建饰）与扶桑鬼冢的比武大赛上，布崇文意外丧生，成龙伤心不已，而布家总管计昆却趁此时谋夺布家家产，成龙被赶出布府，又被杀手追杀，危急时幸遇杀猪贩子霍一刀（胡均饰）所救，两人便义结金兰，开始闯荡江湖。上官一剑女儿上官红（陈德容饰）为医父病，与管家四娘（邱淑宜饰）前往云梦山上寻找解药，不料一路危机四伏，幸有人称七决剑的萧逸龙（焦恩俊饰）出手相救，逃过一劫。成龙对上官红情有独钟，灵蛇夫人（李欣饰）的爱徒青丝（梁又南饰）和成龙邂逅于山洞中，明珠视他为托付终生的对象，纠缠不断。可爱率直的霍明珠与阴险妖娇的佘青丝，同时爱上聪颖活泼的布成龙，然而，布成龙却不领情，和冷峻风流的萧逸龙同时爱上娇生惯养的上官红，偏偏娇俏的上官红根本不理布成龙，独钟萧逸龙，但是天不从人愿，萧逸龙竟是上官红同父异母的哥哥……　　她仿佛落入了永世轮回的诅咒之中，无法超生……