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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:5. The exclusive lounge is very considerate.　　爱之助左眼总能看到映像到底有什么意义？未知的犯罪组织又是出于什么目的使得爱之助夜夜受惊？爱之助唯一的亲人、他最爱的哥哥究竟为何而死？ 　　该剧将讲述高丽人奇子敖的女儿在家人被高丽王杀害后，以高丽贡女的身份被进献给元廷，通过一系列宫廷权利斗争，从身份低微的掌茶宫女，最终成为元朝皇后的故事。Liezi in Daily Life:前有夷人恶狼，后有明廷猛虎，只有杨长帆清楚，看似繁荣的徽王府，即将经历自汪直被斩以后最大的考验。When Gu Xixi entered the league again, there were already tens of thousands of spectators-which was inseparable from the total population of the stars-but Gu Xixi had neglected so much.