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沈悯芮回嘴总是那么快，我早已是戚继光的人了，没的选。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:The setting method is shown in the following figureSome historical events have been neglected for a long time in China, and Aban's books have played a role in sinking. For example, the visit of Lin Bai, the father of the world's global flight, to China is historic and dramatic, but most of us do not know much about it. This book has detailed records.　　秦国，赫赫有名的秦昭襄王寿终正寝，重病中的太子安国君即位称王，并立庶出的公子异人为太子，出身楚国王族的王后华阳夫人执掌了国政大权。她也是异人的嫡母。Picture above first.(2) Rowing boats may display the lights required by this regulation for sailing boats, but if they do not do so, they should have at hand a white flashlight or a lighted white light to display it as early as possible to prevent collision.