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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:Iron Fist Princess KabaliI'd better wait for the learning version. I don't expect anything else. Ha ha, thank you for 3DM's great selfless sharing and dedication.清洁工人老杜在工作时捡到了三十万元巨款。他心无杂念，第一时间把钱带回环卫队，联系到失主后交还了三十万元巨款。电视台一名新进女记者前来采访，队里上下对此事都是全力配合，但老杜却拒绝接受记者的采访。当晚播出的电视节目里……今天办公室 明天浪漫室全剧以主人公宝生的一生为叙事线索，讲述了他从童年到老年二十个相互关联又相互独立的故事，二十个故事几乎涉猎了本世纪中发生的所有重大历史事件，从世纪初叶的南方小镇到四十年代的京城，从繁华一梦的旧上海到改革开放的深圳，辐射面极广地展示出不同时代所带给普通百姓的喜怒哀乐，从家庭的角度深刻地折射出时代的发展与变迁，而每一个故事又都娓娓道来，细致入微地刻划出一个个富有时代色彩、个性鲜明的艺术形象，从而形成一幅二十世纪中国人文景观的“清明上河图”。