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Circular references in ES6Visitor 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连续取了十几片瓦，终于露出了一个四方的天窗。1. Understand the policy patterns in javascript可是，当泰德遇到了率领着战斗部队的阿亚纳米参谋长时，他的记忆恢复了。本片是“憨豆先生”Rowan Atkinson罗温.阿特金森于1995-1996年在英国领衔主演的室内情景喜剧集，讲述的是一个英国警察局里发生的种种趣事……