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待他走后，胡老大等人冲进来，见自家少爷胸前出血，浑身颤抖不止，吓坏了，急忙去叫坐堂大夫来查看。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:Editor _ Xia Mu今日这段遭遇，虽然香儿他们不是故意的，但总是因她而起，还望秦少爷大人大量，莫要事后怪罪他们才好。当一个人在寻找他需要的东西时，却在他回家的时候发现了它。陈启笑着说道：就是之前事太多，才没有过来。You can scan the following two-dimensional code or directly search the public number: CharlotteDataMining. Thank you for your attention.