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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:刚刚使得乌烟瘴气的秦国恢复一线生机，正想要有一番作为的时候，上天却没给他这个机会。The goal of this strategy is to reduce the attacker's speed by limiting the frequency with which the attacker tests the payload against your system. By limiting the frequency with which attackers perform tests on your system, they can effectively reduce the speed at which they design harmful payloads.* * Hello, fans * *RF1, …莫非他有别的什么依据。