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//Create memo我这边过除夕的时候，会给你打电话的。背景设在维多利亚时代的医疗喜剧。警队实习生刘颖（孟霞 饰）在保护港商的任务中被一大叔顺手牵羊拿走了手机和高档包，得手的大叔将赃物作为礼物送给了侄子小强（赵英俊 饰），刘颖打电话要求赎回手机，小强见有利可图，遂带着行骗家族的优秀基因踏入了城市。小强进城投奔困窘中的同乡好友四毛、小翠，三人使出诸多谋生手段，从兜售假成人片光盘到扮乞丐要钱无所不包，小强更利用油嘴滑舌从警察刘颖还有黑社会大姐大李太太（金巧巧 饰）手中一次次逃脱。在又一次被刘颖捉获之时，小强突发神勇，凭三寸不烂之舌救下了遭黑社会坑钱的工厂主吴大成（那威 饰），并答应帮其讨回欠款，于是小强开始了与黑社会斗智斗勇……　　封店让所有人不明所以、惊恐万分。唯独曹雪反应异常，她愤怒地指责哥哥希文丧心病狂似的只顾报仇，甚至无视亲妹妹的安危……希文说可以借机打击应急大队并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: