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比如说，学习很多东西都要通过书，如果不识字，也就看不懂书，因此要先识字对吧？对。Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:这个故事为了开发打倒英雄的怪人而奋战这是另一个专业人士每天的记录。　　《热点推手Notorious》被ABC预订，灵感由现实的刑事辩护律师Mark Geragos 及执行制片人Wendy Walker之间的关系改篇。描述在刑法与新闻媒体互相挑衅的世界中，一个富有魅力的律师及一个富有权力的电视制作人，如何利用﹑控制媒体﹑司法系统，甚至……控制对方。Code as above; Write three functions of order500, order200 and orderNormal respectively, and process their own business logic in the functions respectively. If their own functions cannot be processed, they will return the string nextSuccessor to pass it back, then encapsulate the constructor Chain, pass an object fn into it, and have their own attribute Successor. There are two methods setNextSuccessor and passRequest on the prototype. The method setNextSuccessor specifies the order of nodes in the responsibility chain, and saves the corresponding method to the attribute this.Successor, chainOrder500. SetNextSuccessor (chainOrder200); ChainOrder200. SetNextSuccessor (chainOrderNormal); Specifies the order in the chain, so this.Successor references the order200 method and the orderNormal method, so if chainOrder500.passRequest (1, true, 500) is called for the first time, the order500 method is called, output directly, and chainOrder500.passRequ is called for the second time.(two) the site construction area of more than 300 square meters;