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Let's take a look at the original code: a Visitor class that holds the objects to be accessed.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:1993年 ルパン三世ルパン暗杀指令 鲁邦暗杀指令小爷这么俊，拿个碗像啥样子，人家还不把我当要饭的。尹旭笑问道：不知郦先生此番前来，有何贵干？汉王有何交代？郦食其叹道：汉王犹记得当年与越王并肩作战的情形，也记得当年鸿门宴时，汉王与越王结为同盟。十年前，高中生YOYO应父母的要求到英国与指腹为婚的张十三完婚，两人商议假结婚却在这期间产生了真感情，并走过十年婚姻。经过十年磨砺， 年龄的差距让已到而立之年的十三越发渴望安定的生活，他与YOYO之间的摩擦不断升级。每到争吵时， YOYO便扬言要离婚。 在十三和YOYO的一次吵架中，两人分居了，十三遇到女学生董怡，YOYO遇到了青梅竹马的富家子林书浩，他们十年的爱情最终是否会继续下去呢3. Operating system: Windows 2000 or above (Windows XP SP2 or above is recommended).