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《完美案件》是一部以硬推理为核心的侦探类悬疑剧，主要讲述世界上有那么一群人，不以爱情、金钱、权利等世俗所理解的动机，纯粹是为了证明个人的智力，能力，以制造没有破绽的案件为目标，蔑视生命，残忍犯罪，即所谓的完美案件，他们最终能得逞吗？不由得疑惑道：韩信，这个名字似乎听过，有些耳熟的样子？项羽坐在主位上，脑海中依稀浮现出，在彭城的时候。胡宗宪说着以难以理解的表情望向二人，你们却不同，根本没什么留恋，没什么牵挂，就好像……没有根。略微的犹豫之后又放弃了，毕竟自己只是猜测，未必正确。Robert Pool)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:Example: xylem of Juniperi lignum juniper