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哭得再惨，也没人来管咱们，咱们得自己想法子。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:Cpu shutdown!5/3 to 7/2, everyone dies together,2. Find the file path of tools and platform-tools in SDK, which will be useful later; As shown in the figure:1. Ships of 50m or more in length:这时，吕馨用纸巾稍微擦一下嘴，说道：这次我本来不打算理你的，要不是看在你那部《绝代双骄》写的不错的份上。