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尼玛的，早说啊，早说就不下这么重的礼了。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:……《第一次亲密接触》的成功，让天启的人气暴涨一个台阶，不再像之前那样，仅被武侠读者所熟知，现在天启的粉丝中多了许多憧憬爱情的少男少女。说完，还叹了口气，做个好媳妇可不容易。Internet Drug Information Service Qualification Certificate: (Beijing)-Operation-2010-0004 Haidian Public Security Bureau Network Record Number: 1101081197As for why, look at the following development cases.