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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:紫月剑，你既然这么不要脸，我还客气什么？易风轩义愤填膺，决定把紫月剑的黑历史扒出来，还大众一个真实的紫月剑——表面上人模人样，其实私底下劣迹斑斑。Computer computer = new Computer ();保证西楚国在进攻齐国的过程中，南方之地不受侵扰。发生何事？何故如此慌乱？那名小将本想挣脱，一抬头瞧见了面孔，立即恭敬道：禀报龙将军，我军大营中心位置受到袭击，情况不明，我等正赶去支援。