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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:海归派神经外科医学博士沈知鱼来到地方某大医院工作。初一到岗，便完成数例高难度神外手术，因此受到了神外主任兼院长叶南山的器重，并被委以神外副主任的重任，同时还赢得了院长千金叶如琴的芳心。但是，这一切也引起了神外另一副主任马培德的不满。马是叶南山的学生，几年来一直锲而不舍地追求叶如琴，眼看着唾手可得的一切即将被沈知鱼轻而易举地拥有，他对 沈知鱼嫉恨交加。　　刑警郝敏和公交司机田大宇青梅竹马，正在筹备结……　　情场失意的港生转投向Sabrina怀抱，但他们正打算结婚时又遭父母反对，原来嘉嘉事件重演：Sabrina也是世仁的私生女!大王安然无恙，而且还‘剿匪大获全胜，民心和军心都受到了鼓舞，正好整军备战。本片是一部古装喜剧，讲述宋朝年间，府尹错把浪荡子弟当成京城微服私访的钦差邀请其入府奉若上宾，闹出一系列的乌龙事件3. Leadership Interview一更求粉红订阅。