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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:Villagers: Do you think one is from the countryside and the other is a reporter from Beijing? Can this last long?上午的时候，葫芦板栗他们上山，几个小的被勒令不准去，很不高兴，郑氏就让下人带了他们去山谷里玩。13 \"Nihon Kai Kaisen\" (日本海海戦)Efficient DDoS Attack Detection and Analysis Tool FastNetMon是啊，《葵花宝典》真是个好东西，让人慢慢悟到了人生妙谛，明白了天人化生、万物滋长的要道。I have to say, 33-year-old Jia Min is already a rose that has passed its flowering period, but it still exudes seclusion...