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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:你是谁？你想要什么？你爱干什么？这些都不重要，重要的是你怎么把东西卖出去。《广告狂人》由《黑道家族》的制片人和编剧Matthew Weiner出品，背景设定在上世纪六十年代，聚焦于这个美国梦形成继而破碎的年代，大胆地描述了美国广告业黄金时代残酷的商业竞争。《广告狂人》第二季的故事结束于冷战的全面爆发，彻底击碎了中产阶级独自安于一隅的美梦。第三季的故事从预告片来看也应该走向更加绝望与悲观的阶段。我们不难看出剧集片头中一个男人坠落的画面，不知是隐喻本片的主人公的生活，还是指60年代美国梦的殒落。"Report" no longer needs to be described. . . The first crystal in the community league is eight digits,当她工作的医院被运送到月球上时，医学生玛莎·琼斯与医生联手在氧气耗尽前追捕一名外星逃犯房租是六千一个月，交了半年，剩下的四千算是押金。