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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. Stockholm Syndrome孩子生的早就是太子了……子夜，用力啊，快。这下三人更奇怪了：到底是谁，有这样大的威风。四个女孩Duchess、Sundae、Mimi和ViewViva住在Jam夫人的公寓里，这栋公寓有一个严格的规定，那就是：不允许男孩进入这栋公寓，但是她们的爱情却都发生在这栋公寓里……Test Scenario 1: Repeat to Jump Yourself (Set SingleTop Yourself)此剧讲述三个女人因错误的欲望和贪欲酿成悲剧，她们在疯狂斗争中寻找人生答案的故事。