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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:西楚霸王项羽更是有些郁闷了。小说中我们的女主风小小也就是女娲虽然最后和伏羲在一起了，但是风小小明明先认识的杨砚也就是二郎神啊，不过要是他们真在一起了这个应该是个意外结局！Friendship Link: Detailed Explanation of Ubuntu Installing JDKReporter: Everyone's reaction is what they think.No. 76 Nora DanishSince Mr. Fan Hui launched the training and consultation on "Learning from Huawei: BLM-based Product Strategy and Planning" in 2015, the questions consulted by the vast number of customers have also focused on the above three issues.