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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:君上摇头道：不可掉与轻心。众臣仰望他们的新帝，只觉心头敞亮。可惜林思明遇到的，是从另一个世界来的自己，那么这一切顿时就不同了。独居吉祥寺的大学生・纯（桥本爱），某天被找寻已故父亲昔日恋人・佐知子的高中生ハル（永野芽郁）造访。一起寻找佐知子的过程中，两人结识了佐知子的孙子・トキオ（染谷将太）。三人从去世的佐知子的遗物里找到录有ハル父亲和佐知子歌声的开盘式磁带，但磁带中途歌声戛然而止，因此，三人决定共同完成乐章.....Class ProgramIt is already the highest sales volume in the history of the single title of the card form, and it is still setting new records. After the ice sheet is released, 20 million yuan is also in sight.