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一场盯梢与反盯梢的行动就展开了。Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From EncyclopediaDirectory　　MuangJai在一座寺庙中睡着了，一阵狂风之后，他在2000年后的一个晴朗的早晨醒来。Lin Shucheng, vice-chairman of the Sichuan Provincial Committee of the Chinese People's Political Consultative Conference and secretary of the Liangshan State Committee, said that "Charming China City" has greatly enhanced our national cultural confidence and promoted tourism development. Last year, the growth rate reached 19.7%, and in the first quarter of this year, the growth rate reached 47%, showing a spurt of development.