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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:前田敦子将主演NHK漫改电视剧《传说中的母亲》(伝説のお母さん)！故事脑洞很大，讲述一名曾击败魔王使世界恢复和平的女魔法师，在平静的日子里生下小孩成为家庭主妇，结果魔王复活，她不得不成为兼顾育儿和维护世界和平的魔法师母亲。 该剧共8集，将于2020年2月1日开播。……呼——不知过了多久，郑武深深呼出一口气。张家人听他这样表态，都傻眼了。唉，看来老主人和尉缭先生的期望怕是老落空了，不过自己的使命还是要完成，子婴还是要救出去的。她的直言不讳和大胆爽利让洪霖十分意外。