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2. High requirements for technical research and development;哼，确实要胡家出银子，他这就跟他讨要。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:A Toronto police officer investigates a murder while visiting his father in India."Because I have heard some scout comrades who came down from the enemy's rear say before, The Vietnamese army has the habit of dogs biting people. They just take advantage of the dog's low stature, The advantage of fast moving speed, Avoid fire, Then they rushed to the position with explosives and died with us. There is also the gunner who rushed up with the dog and bit us. Good jamming the gunner's shot, Buy time for their attack, I heard that they learned this tactic from Mao Zi. I don't know exactly what is going on. Anyway, that kind of "dog" is fantastic, with a large number and fast speed. It is difficult to hit all kinds of light and heavy firepower on hand. The closer they get to the position, the more they will take some simple evasive actions, which cannot be prevented.我们为什么要这麼做……？ 哈尔希洛回过神来，才发现自己身处在黑暗当中，他完全不知道自己人在何处，也不明白这个地方是哪里。 他的身边有一群和他一样失去记忆，只记得自己名字的男女；而离开了地底後，等待著众人的是一个「宛如游戏」的世界。为求生存，哈尔希洛与自己有著相同境遇的夥伴们组成队伍、学习技能，以义勇兵见习者的身分踏入了这个世界--「格林姆迦尔」。没有人知道未来会遇见什麼……这一切，就是从灰烬之中所诞生的冒险谭。再晚些时，他就没有机会走了。