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1. Breeding crayfish, First of all, we must find a good venue. Ponds or paddy fields can be transformed. Attention should be paid to the fact that it is best not to have farmland water flowing into the ponds around, because pesticides must be applied to grow rice now, and if pesticides flow into your ponds, your shrimps will die a lot. If they die, they will generally sink to the bottom of the water, and you cannot find them. Therefore, attention should be paid to the selection and pulling. Water sources should be guaranteed and water should be exchanged for drainage and irrigation.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:　　在韩国目前当红的电视剧是以家庭伦理、亲情为主轴的“写给父母亲的信”，由许峻豪、金喜爱两位硬里子演员担纲男女主角。在帅哥、美女组合的偶像剧竞争下，这部戏以剧本、卡司、演技三位一体，赚人热泪，收视率高居不下，许峻豪和金喜爱更散发出熟男、熟女的魅力，赢得观众喜爱。　虽然仍在赶戏，但是许峻豪与金喜爱仍抽空在戏现场附近的六三大厦接受了台湾影剧记者的联访。两位之前都曾为戏宣传访问过台湾，许峻豪最怀念台湾的小笼包，希望再次访台尝美味。注重运动养生的金喜爱则怀念台湾的脚底按摩。二十世纪三十年代，能力出众，机智果敢，却没有坚定信仰的伪满警察许从良，在哈尔滨警察厅险恶的内部斗争中，凭借出色的破案才能，赢得了警察厅厅长金荣桂的信任；另一方面，许从良出于对警察厅刑事科科长关海丹的爱慕和对共产党人的钦佩，一次次帮助关海丹转危为安，并在多次行动中与关海丹并肩战斗，成长为了一名真正的共产党员。在血雨腥风的伪满警察厅，许从良一直在剃刀的边缘，与关海丹从敌对到合作，再到心心相印，最终赢得了关海丹的爱情，也收获了坚定的信仰。　　古灵精怪张卫健立身之作，再现“韦小宝”风采。　　一个微妙的转折发生在银河帝国建国后的12020年。哈里·谢顿，这个刚满32岁的年轻数学家，开创了“心理史学”，这门学科能用数学公式准确推演全人类的未来——“预言”从此成为一门可以信任的科学，人类由此可以看见未来...