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The general JS code is as follows: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:曹氏不便拿主意，又不好一句话不说，沉吟一会，斟酌言辞道：田家刚为这事受了打击，咱们实在不便提这事。这绝对是玉米能干出的事。　　在魔术产生盛行的维多利亚时期，出现了两位极有天赋的年轻魔术师，最为难得的是，他们还是一起长大的好友：罗伯特·安吉尔性格复杂而且历练世故，是一名天生的表演家，他知道如何在舞台上将自己完美地展现给观众。武当长老、众弟子一个个举着剑，红着眼，视她如敌寇。要不是我早晓得这地方有个洞，还不能发现哩。