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It began in ancient duels and prevailed in Western European countries. The first Olympic Games in 1896 was listed as a competition event and was the only event that allowed professional athletes to participate in the early Olympics.那熟悉的声音冷笑道：十两，到手。来到重构世界后，卿尘却发现周遭的一切已经物是人非，巫族背负了谋逆血案，元凌身世也迷雾重重，面对卿尘，元凌已完全宛若陌路。命运让他们再度相遇，卿尘却不得不隐藏自己对元凌的深情，暗中守护、辅助元凌。相守相知却不敢相恋，情路坎坷而又漫长，当时空扭转，前尘不再，相逢的人可否再携手？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:退伍消防员林渊始终未从失去搭档的阴影中走出来。为完成战友生前心愿，林渊在香港受训成为一名纹身师。在他的小店开张前夜，一位失独母亲的忽然造访，把林渊的记忆重新拉回到5年前的熊熊火焰……从此，林渊与楼上的心理咨询师女房东、失手的儿科医生、破产边缘的金融CEO，一群受伤的都市人，开始了一场关于自责、复仇、承诺、梦想的的命运交织。Eight: Understand the policy pattern in javascript韩海媛为了进罗罗服装设计的设计图不小心遗失，而被罗罗服装的新员工李江图捡到，江图欲还给海媛，在途中却因塞车而与海媛错过，海媛因而丧失进入罗罗的面谈机会；江图被傲慢的设计部长黄茱莉命令假装成男友，以避免其父安排的相亲。