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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:故事发生在马里兰州切萨皮克湾（Chesapeake Shores）沿岸地区的一座小镇，O’Brien三兄弟亲手设计并创立了这座小镇，这个爱尔兰裔美国家庭也因此成为当地最重要的势力。然而因为内部矛盾加剧，这个家庭最终四分五裂。多年之后，一家人再次团聚，但他们不得不回忆过去的痛苦经历，同时面对难以确定的未来。他们很快发现，学会融洽相处是一件非常重要的事情。 网络电影《星际高手》由李翰韬导演，讲述了一个学渣回头金不换，摇身一变成学霸的故事，即将在优酷上映。一碗牛肉汤将引发怎样的“血案”？敬请期待。这尼玛都是什么情节？那个林平之，已经让郑武越看越不顺眼了。唐僧师徒四人赶奔西天，渐觉热气蒸人。问及乡里，才知此地唤做火焰山，无春无秋，四季皆热，山周围八百里火焰。受阻于火焰山，孙悟空、猪八戒到翠屏山芭蕉洞找铁扇公主公主借灭火的芭蕉扇，铁扇公主不肯借予。孙悟空变只小虫钻进铁扇公主腹内大闹，结果拿到手的是一把假扇子。猪八戒又化作牛魔王的模样从铁扇公主手中骗到真扇。牛魔王这时正在跟狐狸精寻欢作乐，听到扇子被抢走了，赶紧回到家中，接着又化作孙悟空的模样从猪八戒手中骗回扇子。影片结尾，悟空和八戒，以及乡亲们联手打败了牛魔王，终得宝扇，扇灭火焰山的烈火，登上取经的路程。影片中的牛魔王其实“日本鬼子”的影射，正值抗战时期，万氏兄弟想借此片鼓舞全国人民的抗战热情。而且彭蠡泽也是他们水军训练的上好基地，不会受到打扰。