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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:善良乐观、积极向上的曾善美为了供养大大小小一家人和资助在杭州攻读硕士的男朋友景融，每天身兼数职，辛苦打工赚钱。有人说她傻，但是善美却问这样的付出甘之如饴。景融即将毕业，善美不顾家人和朋友的强剧照烈反对，决定为爱远走天涯，她辞去工作只身奔赴杭州，满心期待着和男友结婚。15死后的困难，那个男神东玉宇　　Host Jimmy Carr attempts to solve the worlds biggest problems through comedy.翘儿使劲摇头：谁说长帆就一定做不成事。新中国解放前夕，白纸坊警署小警察徐天在追查未婚妻贾小朵被害案件过程中，意外参与到中国共产党和平解放北平的事业当中。面对动荡的时局，金海、铁林和徐天三兄弟所处不同的位置，在亲情、爱情，国家利益、个人信仰发生激烈冲突的时候，情同手足的三兄弟做出了不同的选择，走上了截然不同的人生道路。徐天和共产党员田丹在绝境中相识，使命感让两个人走到了一起，徐天选择在动乱中协助中国共产党取得了北平的和平解放，迎来了新世界。