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5From 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:春秋时期，晋国最强大的太尉屠岸贾，掌握着晋国的政治、经济、军事三大命脉，他制造了宫廷政变，让景公误认为赵朔是政变主谋，盛怒之下，命令屠岸贾将赵氏灭族。程婴冒死救下赵孤，并巧妙地栖身屠岸贾家。十八年后，屠岸贾的儿子文武双全，是晋国政权的一颗新星。但却有谣言说他并不是屠岸贾的亲生儿子。随着最终谜底揭开，屠岸贾当年对赵氏灭族的残酷血案昭然若揭，而屠越其实叫做赵武，是真正的赵氏孤儿。隐忍一生被周围人唾弃的食客程婴，在最后一刻赢得了胜利，赢得了正义。板栗骤经大变。16. Code: punch; Hit you, wait.拳手肖金诚成日醉生梦死，看上去人模人样，可谁都知道他是个混吃等死、坐吃山空的loser。但他意外获得了一次咸鱼翻身的机会——中了500万大奖。肖金诚打算用钱买回自己过去丢失的尊严和失去的拳馆。神秘女孩钱小蝶却盯上了这笔横财，对他处处使绊，鬼使神差的败光了肖金诚所有的钱。算盘落空，一无所有的肖金诚恨透了钱小蝶，但他也渐渐发现，钱小蝶并不是在乎他的钱，而是希望他能让自己振作起来，靠自己而不是靠意外横财去赢回所有。肖金诚为了钱小蝶，也是为了自己，刻苦训练，以命相搏，准备挑战不可能战胜的大师兄。