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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:4 和美国或友或敌，致力扩张什叶新月，插手之多，无人可及艾玛·汤普森加盟限定剧《未来15年》(Years & Years，暂译)，BBC、HBO、Canal Plus联合制作。导演西蒙·赛伦·琼斯(《大西洋帝国》)，编剧拉塞尔·T·戴维斯(《英国式丑闻》)。剧集时间设定在未来，围绕一个英国家庭从2019年至2034年15年内发生的故事展开。汤普森在剧中饰演一个女政客。该剧目前已在曼彻斯特开拍。范增点点头，淡淡一笑，目光中透着丝丝温暖。Over 30 million and over 50 millionMurderer Liang's Husband一个戏班子来到了一个镇,叫钱扇镇,做文艺汇演,重新推广京剧,住进了一个古宅,古宅周围有许多有些诡异的东西,邪恶的看门老人,荒野,坟堆,送葬的人,疯汉子 ……一场惊心动魄的故事就此上演 ……