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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:牛虻一个为了自己的革命信仰，甘愿被命运折磨的人。他深爱过两个人--父亲蒙坦里尼和高洁的女人琼玛，但后来的他一生都没有再给机会让他们来爱他。他的内心承受了非人的炼狱般的折磨。他给我们留下的思索是：人到底该为什么活着……奥拜隆少将及其秘密突击队发现在太平洋的巴拉罗亚岛上， 一种致命辐射正在破坏大气臭氧层，令全球气温迅速上升至危险水平！而他们不知道的是, 这一切竟然是一班原始外星人要毁灭地球的阴谋！奥拜隆少将一方面要带领步队应付岛上的野蛮土著，另一方面更要阻止那群凶悍的外星人继续侵害地球……Sprinkle powder