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这时，青木也赶了过来，在张槐示意下拉住郑老太太。就听一声怒喝传来，众人循声望去，原来是白凡。只要你喜欢，我就会不计后果地为你做任何事。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 Encyclopedia黄豆和黄瓜连连点头。香荽就递给了他。•希望之夢（菅野美穗）