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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:敬文的舅舅 17 岁时被卡车撞上，从此陷入昏迷。17 年后他奇迹苏醒，敬文去医院探望舅舅，却只见他独自胡言乱语，宣称自己是从“大巴哈马鲁”异世界归来。"Of course, it is impossible for fur to resist bullets. As long as you hit it accurately, you can kill one with a maximum of two shots. The speed is not slow, but it is not impossible to hit. If they only run on flat ground, then there is really no threat, but-they will drill the ground!"It will be helpful to practice effectively and deliberately when there is no mentor, as long as you firmly remember the three F's.刚才周星河和一家媒体约了后天，你们只能排到大后天……导演彭文洲刚挂上手机，几秒不到，手机又响了。这个时候，匈奴若是因此得到引导，大军南下，后果无疑不堪设想。