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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:火炬木小组是英国卡迪夫市的一个秘密行动小组，他们专门抓捕外星人，搜集并研究外星物件，并利用外星科技来解决犯罪案件，不仅是人类的，也包括外星人的……"他们不受政府，警察甚至联合国的管辖，追踪地球上的外星生物，为了未来用外星科技武装人类，21世纪将发生巨变，你必须做好准备……"　　朴宝英在剧中饰演的女主角高世妍本体（金莎朗饰）原本是中央支检检察官，拥有着大韩民国上位1%的外貌性感高挑，是中央支检部的女神和骄傲，被唤为法律界的Wo nderWoman，过的是如同 在高速公路上赛车般的人生。但是因意外的事故失去生命的她，通过灵魂复活珠子Abyss，复活成了与自己此前完全相反的女生，复活重生成律师事务所的性格平庸，相貌可爱的的平凡女生（朴宝英 饰）律师，而开始逆袭，性情大变。　　(*^◎^*)After ten years of investigation and study, they finally found the answer. The main reason why the poor cannot get rid of poverty is the scarcity mentality.激策则存在双重风险，第一是正面与这些鬼倭开战，自己可能会死，会败。