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杨长帆也由惊转喜：此前并未有这样的部署，光头也是百战成精了啊。再喝些水，晚上还睡不睡觉了？云影抿嘴笑道：我也没法子，还不是你外婆，说青山说的，他什么都想吃。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:Of course, the software design pattern is only a guide. In actual software development, it must be selected according to specific requirements:前路已经已经被英布堵死，蒲俊也调转枪头来对准自己。在这部妙趣横生的科学剧集中，古怪生物和大自然母亲担任旁白，带你一窥地球上最不可思议的动物的生活。