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可见，咱们要时时刻刻小心谨慎，就算是平常，也不能大意。(2) Multiple factory method modes?State machines also have a wide range of uses in game development, especially the logic writing of game AI. The main characters in the game have various states such as walking, attacking, defending, falling and jumping. These states are both interrelated and constrained. For example, if attacked during walking, it will switch from walking state to falling state. In the state of falling, it can neither attack nor defend. Similarly, you cannot switch to the defensive state during the jump, but you can attack. This kind of scenario is very suitable to be described by state machine. The code is as follows:　　金承佑饰演冷静的神经外科医生，是一个充满魅力的男子。你们的婚事也就不同于寻常老百姓家。However, this method has great limitations. XMLHttpRequest requests are usually used for asynchronous refresh of local pages in Ajax methods. Not all requests are suitable to be initiated by this class, and the pages obtained through this class of requests cannot be recorded by browsers, thus carrying out operations such as forward, backward, refresh and collection, which brings inconvenience to users. In addition, for legacy systems that do not have CSRF protection, to use this method to protect, to change all requests to XMLHttpRequest requests, this is almost to rewrite the entire website, which is undoubtedly unacceptable.