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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:　　影片改编自八月长安振华系列，为电影《最好的我们》续篇。指着人头攒动的街道为难地对赵锋道：可是将军，你看这里……赵锋道：这里咋了？有人打架闹事了？人家老百姓啥也没干，你还不许人家瞧热闹、卖东西？大路朝天，他们想从哪过就从哪过。Supporting education, legal publicity, low-carbon publicity, interesting psychological games, entertainment shows? , mock trial... I still vividly remember the dribs and drabs of this process, but I can't record them one by one with a pen. Every time, when I think of the heated discussion in the regular meeting, I am full of enthusiasm. When I think of the busy figure of everyone in every activity, I am filled with emotion. When I think of the simple smiles of the students, I am full of happiness... Growth seems to be a matter of an instant, but I understand that I experience growth through experience. This kind of growth, how precious!这一切都被项羽所霸占，成为西楚国的领土。　　本片荣获2009年威尼斯电影节Christopher D. Smithers Foundation特别奖。