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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:我一路跟过来，还真是这样。正是因此，他比任何人都在乎秦国的存在，其实内心之中更多在乎的可能还是那个统一的梦。长剑挥动，武当四大长老，两人断剑，两人重伤，四大弟子作鸟兽散。大苞谷笑眯眯地说道：我可不是就这么说的。