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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:扯到了这事，杨长帆正好问道，最近村县有什么活动么？我想想……凤海思索片刻说道，赶着县试，嫁娶一类的事情都错开了。In the morning when she got up to cook, he went to bed.　　直到夏日某一天的黄昏时分，小镇一个宁静的区域陷入了恐慌。人们毫无预兆、毫无理由地晕倒，任何试图进入该区域的人也会遭遇同样的情况。风宫库洛自幼和父亲过着相依为命的生活，哪知道，有一天，这唯一的依靠也不告而别，只留下高筑的债台，需要库洛来偿还。为了还债，库洛来到了债主白龙院家，他将在那里担任男仆的职务，用劳动来抵债。白龙院家的少爷米斯是一个性格古怪充满了恶趣味的人，他给身为男性的库洛穿上了女仆的制服，以此为乐，并且不断的骚扰着库洛，令后者十分苦恼。1893年英国军队入侵印度时期，英国军队以保护印度各省的统治者拉甲为由，派兵驻扎各地，收取印度各省农民高额的租税。在印度的一个小乡村里，人们都期盼着雨季的到来，雨水滋润土地有个好的收成。但晴朗的天空没有一丝云彩，太阳晒得土地都龟裂了。村里的小伙子拉凡悄悄的躲在林中，阻碍驻扎在他们那里的英国军官罗素打猎。不久罗素发现是拉凡惊扰动物们逃跑，抓住他后，罗素见拉凡是一个乡下农民又傲慢地放他走了。拉凡同村的女孩高利在树林边找到他，向拉凡暗示了自己对他的情意，拉凡捉弄高利，装着没有听懂，笑着跑开了。罗素请该地区的拉甲到他驻扎的城堡吃饭，饭桌上，拉甲请求罗素在今年干旱的情况下，减免一些租税。罗素坚持要吃素的拉甲吃一块肉后，他就减免今年的租税。拉甲拒绝以后，罗素恼怒地把前一年减免的租税加到了这一年。拉凡所在的村里知道这个消息，都惊慌起来，他们就是卖掉家里所有的东西，也付不起罗素加收的租税。村长带领拉凡和村里的一些男人们，到罗素的城堡里去找拉甲，请求他恳请罗素减免租税。拉凡一行到达城堡，看见罗素和他的军官When parents are unable to solve their learning needs through in-school and out-of-school subject cram schools, and are limited by personal ability, time and other factors, and cannot provide their children with adequate family education, they are bound to turn their eyes to thinking ability training institutions in the market. Therefore, thinking ability training can be said to be the "rigid" demand of the market, not just the one-way result of institutions catering to the market.