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Parsing: Typeof returns a string representing the type, always returning a string.The difference between them is that each policy class in the policy mode is equal and parallel, and there is no connection between them. Therefore, customers must be familiar with the functions of these policy classes so that customers can actively switch algorithms at any time. However, in the state mode, the behavior corresponding to the state and the state has long been encapsulated, and the switching between states has long been stipulated to be completed. The "change of behavior" occurs within the state mode. For customers, they do not need to know these details. This is what state patterns doHigh-level attacks on classifiers can be divided into the following three types:The setting method is as follows:Song Huiqiao: HK million per year; Chen Daoming: RMB 1.8 million per year