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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:During this period of practice, We walk through the streets and come into contact with all kinds of people and things, which cannot be felt in the school. There may be teachers in the school who say what to do on this day and what to do tomorrow, but there will be no one who will tell you this. You must understand what to do, do it yourself, and do your best.等到春暖花开，说不定还会惹起疫病，那就大大的不妙了。The family discover Leslie has three girlfriends, Louisa comes up with an idea to help him choose one of them. Gerry adds to his animal collection, Larry injures his leg and Aunt Hermione arrives in Corfu to stay permanently.胡钧扬眉回道：野蛮的丫头。然而造化弄人，在机缘巧合之下，飞刀和野狗之间竟然碰撞出了爱情的火花，为了成全各自心底的感情，他们都选择了隐瞒他们的真实身份，这为日后的矛盾买下了引线。纸是无法包住火的，当两人之间的感情被帮派发现后，他们被打上了叛徒的烙印，遭到了同伙的追杀。比如当年吴王夫差为了北上争霸，运输兵员和粮草比较方便，特意修造了邦沟。