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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:Example: the flower of Matricariae flos都温习透了。Keep your name, keep your name and look at it slowly.世人只道我等在此谷中，必定受罪吃苦，却不知这许多聪明才智之士在一起，怎会吃苦？此谷本来就是天下最逍遥自在的地方。1944年年底，在樊庆笙教授等人的努力下，中国生产出了第一批5万单位／瓶的盘尼西林，俗称“青霉素”，成为世界上率先制造出盘尼西林的七个国家之一。中共上海地下党很快得到了青霉素的菌种和配方，并利用中山医院实验室主任齐小云的身份和实验室的有利条件秘密试验和生产青霉素。第一次青霉素样本试制出来后，由医院神经外科主任陈慧琳的未婚夫、上海麻醉协会秘书长邓红负责送出敌占区。然而，由于叛徒出卖，邓红暴露了。为了保证青霉素秘密不被日本人发现，邓红毅然将青霉素样本吃进了自己的肚子，玻璃划破了他的喉咙，对青霉素过敏的他，因青霉素过敏而死亡。正等着进入婚礼殿堂的陈慧琳面对邓红的尸体，不甘心，不理解。为了弄清真相，她固执地去给邓红做尸检。此料，她这一尸检，彻底暴露了共产党在中山医院秘密试验青霉素的秘密。这个秘密马上就被日军参谋本部获知。为了掠夺到这在当时还很稀缺药品的专利，日本人在东条英玑的亲自过问下制定了一个青梅计划，计划的实质内容就是要不择手段地从中国获取青霉素的配方和菌种。国民党政府为了巩固自己对青霉素的