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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:《米兰达》是一部在英国的BBC TWO台播出的情景喜剧，源于一档电台节目“Miranda Hart的玩笑商店”。Facebook宣布续订《节哀顺变》第二季，该剧由伊丽莎白·奥尔森、凯莉·玛丽·陈、珍妮·麦克蒂尔、约翰·艾德坡等主演，詹姆斯·庞索特执导。首季故事讲述年轻寡妇Leigh Gibbs(奥尔森饰)一边处理失去丈夫的悲痛，一边与过去重新建立关系。Three implementation classes:Terror我跟你爹身子骨都好着呢。With regard to plant-dyeing, its unique charm lies largely in its natural color, transporting the quiet and soft tones of the wilderness into a bearable access, with the additional Benefit of increasing skin protection.