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In short, the proxy mode provides an interface consistent with the real class, which is intended to be used to proxy the class to access the real class, the skin mode is intended to simplify the interface, and the adapter mode is intended to transform the interface.The verification code forces the user to interact with the application to complete the final request. Under normal circumstances, CAPTCHA can well contain CSRF attacks.The disadvantage of state mode is that many state classes will be defined in the system. Writing 20 state classes is a boring job, and many objects will be added to the system. In addition, because the logic is scattered in the state class, although unpopular conditional branch statements are avoided, it also causes the problem of logic dispersion, and the logic of the entire state machine cannot be seen in one place.亲卫一手挽着他的马缰，一面点头，问道：然后呢？刘井儿心想红椒性子爽利，不管如何决定，一个时辰应该够了。俞承豪所饰演的福秀学生时期被当成学校暴力施害者惨遭退学，长大后重返学校意欲报仇，怎料别说是报仇了，却卷入了意想不到的事件之中，将会是一部愉快的治愈系校园浪漫剧.