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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:何人？王离。Strong invincible本剧以近年来发生在沈阳的重大刑事案件为素材，从中精选出十大经典案件，采用纯纪实方式，无虚构、无杜撰，真实再现沈阳市广大公安干警在侦破重案要案中所表现出来的大智大勇、无私无畏、机智巧妙，用自己的生命和热血锄奸铲恶、确保一方平安的感人故事。Beijing赵敏，有我在此，你的阴谋诡计不会得逞的。Lava domineering is a sustained AOE damage to the surroundings. And there will be an additional 30% deceleration after advanced.