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Let's take a look at our traditional AJAX request again, such as our traditional AJAX request. After the request is successful, we need to do the following things: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王穷也不知怎么了，不敢看她，面向黄豆道：若他是假玉米，自然是为了脱身。我要这个没用的，我去跟人打官司，靠的是嘴巴皮子，所以得找个好讼师。　　Freeform宣布续订《#麻烦一家人# Good Trouble》第二季。The soldier who flushed him later blamed himself. I also advised the young man that there was no way out. No one wanted to do this, but there was really no way out. "In order to create a pair of comfortable socks, cotton will be carefully combed before being woven into thread, screening out short fibers while retaining only strong and comfortable long fibers. The toe part of the sock head is sewn by hand to ensure that there is no bulge and the stitches are smooth and can completely fit the toe part. Finally, it is guaranteed that users will be very breathable and fit after wearing Stance.