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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:那么厨师纵意花都，厨师玩转古代，异世界以厨证道，你要哪一款？你对历史不满意，放心那些穿越者绝对会把历史修改到你满意为止。The first expression is equivalent to Math.power (3, 2) = > 9, and Math.power (9, 1) = > 9That's horrible! ! ! ! ! It's really terrible! ! ! ! ! !Please invite celebrities to speak for and choose professional brokerage companies.今天早上来上班的时候，发现小区门口的公交站正在更换广告，新广告正是《白发魔女传》电视剧的宣传照。