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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:可令人升华，可令人堕落。未曾有の危機の中で運命的に出会い、恋に落ちる男女にスポットを当てた本作。彼らは日本沈没までの限られた時間の中でさまざまな困難に立ち向かい、愛を貫く。师兄，你光顾着你的酒壶，它比我的命还重要吗？岳灵珊抱怨道。康纳邀请海沃思家族参加一场49人队的比赛，他正试图完成他的最新交易；汤姆有机会展示他的足球技术；丹尼斯试图让莎拉接受沙米娅对啦啦队的新兴趣。此剧讲述了同卵双胞胎兄弟韩秀浩和韩江浩过着完全不一样生活的奇幻故事，是一部烦恼该如何守护他人人生的笑中带泪奇幻剧。The second method: black screen recovery