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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:5 今清大叔Finally, a Light.prototype.setState method is provided, through which the state object can switch the state of the light object. The switching rules of states are well defined in each state class in advance. No more conditional branch statements related to state switching can be found in Context:8-1 Message: Write a function called display_message (), which prints a sentence indicating what you learned in this chapter. Call this function to confirm that the displayed message is correct. ?It's okay, the devil still can use it.　　《深夜食堂》在2006年开始连载，由于作品气氛浓郁、风格特殊，二度改编日剧播映，由小林薰担任男主角。隔年获得“第55回小学馆漫画赏”及“第39回漫画家协会大赏”。