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5. Whether the test was successful; Win + R, enter the command line, cmd, enter.在这个不诚实的世界里，我想带你一起追寻真相The fighting situation at position 149 to be talked about next is many different from that at positions 169 and 142 mentioned earlier, because for the first time there is a "flying unit" among the "living biological weapons" appearing at position 149.那时，一切都是风平浪静，书友、读者们会愉悦的看着小说，开心的在网上讨论着。小苞谷忙跑到大苞谷跟前蹲下，稀奇地打量他。最初的时候，他不过是一位地方官，根本没得那个得到机密的级别。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: