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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:黑得理直气壮。《喜新不厌旧》创作人推出全新喜剧《#blackAF》，请到肯亚·贝瑞斯与罗希达·琼斯联袂演出，2020 年 4 月 17 日在 Netflix 上线。在青青草原世界，The column of "National Map Open Class" is divided into political history, traditional culture, interpretation of ancient books and records, economic forum, art appreciation, science and technology lectures, intangible cultural heritage explanation, educational schools, life classes, other topics and other categories. Courses such as "Huang Yang: Socrates' Death and Athens' Democracy", "Zhao Feng: Characteristics and Status of China's Mulberry Silk Weaving Skills", "Li Jianrong: Wisdom Played-Three Leaps in Human Thinking" and "Introduction to Yongle Ceremony" are impressively listed.1949年初夏，解放大军以摧枯拉朽之势直抵上海，国民党国防部保密局直属特别勤务处少校参谋邓家骥奉命撤往台湾，并令其妻沈荷同行。登机时意想不到的情况发生了——沈荷临产。这一突发事件把沈荷留在了上海，邓家骥只身一人去了台湾。两人都是长期潜伏在敌人中间的中共地下党员。新中国成立之初，面对敌特分子无所不用其极的破坏活动，斗争的形势仍然严峻，沈荷又悄悄地隐藏起了自己的真实身份，与敌人展开了新一轮的斗争……电影简介Hallucinations-Like dreams, usually strange feelings produced by the brain out of thin air. It can be divided into three types: auditory hallucination (hearing sounds that do not exist), visual hallucination (seeing people or things that do not exist) and tactile hallucination (touching things that do not exist).