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In short, visitor mode is a method to separate the data structure and behavior of objects. Through this separation, the effect of dynamically adding new operations to an interviewee without making other modifications can be achieved. Simple Diagram:几人这才迈进杨府，开始互相之间尴尬的笑，车夫被这一家人笑毛了，卸下东西赶快溜之大吉。这是一部经典的诙谐浪漫喜剧，也可以看作是农村版的花样少男少女。女主Taddao是父亲的私生女，父亲过世后，她的家族身份不能得到正式承认。为了找到父亲的遗嘱证明自己是Bussaya家族的人，她女扮男装变成Tad回到大宅，寻找可以证明自己身份的证据，而男主Por则是她的守护天使，在她遇到困难和危难时，总是第一个帮助她，拯救她，爱意渐渐萌芽，究竟最后Todda能找到遗嘱证明自己的身份吗？她和守护天使的爱情会圆满结局吗？尹旭笑了，许负已经说的很直白。深田晃司导演的初连多。脚踏两条船的“渣男”遇上谎言不断，麻烦制造机的”渣女“，关注在男权社会的欲望中被消费的女性像。福建是我徽王府的，广东是刚刚走的许朝光的。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: