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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:此剧讲述一个拼命向上流而掩盖自己原来身份的男人，与一个为了爱情而抛弃亲妹的女人，两人内心挣扎地争取真正幸福生活的故事。看看假妈在这个剧里的演绎完全不一样的人设！原本庄严肃穆的场合，给爱妻擦汗看似羡煞旁人的爱情，却掉出了别的女人的丁字裤是一不小心，还是刻意为之？某姓徐，字文长，进了山阴提我名号，自然有人指路。　　古都镰仓，不仅住着人类，还有幽灵、妖精、魔怪、神佛、死神、穷神等等。这里是魔界与黄泉的交界之处，是生者与死者的思绪交织之都。而初来乍到的亚纪令本来平静的一色正和的生活也发生了巨大的变化。