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Now let's make some improvements and go directly to the code:For example, we often validate forms, such as the registration login dialog box. We need to validate before logging in: for example, there are the following logics:或是半尺来高的长形，也是凸肚细腰的。** Tablets, film-coated tablets (Filmtablette)故事开始于一所超级白金学院--四叶艺术学院。它是为国家顶级艺术学院输送人才而建立的，毕业生会进入圣马丁，帕森斯茉莉亚等著名大学。艺术是有钱人的游戏，四叶艺术学院里自然充满着名流财阀的子女，在这群高贵的帅哥美女中，有一天，来了一个如小白花般善良天真的草根女，而不出所料的，这朵小白花从入校门的第一天起便遭到校园恶势力的欺凌。This strategy is mainly implemented by imposing rate limits on scarce resources such as IP and accounts. A typical example of this rate limit is to require the user to resolve the verification code to verify whether he publishes too frequently, as shown above.Now use code to describe this scene. First, define a Light class. It can be predicted that the light object light will be created from the Light class. The light object will have two attributes. State will be used to record the current state of the light and button will be used to represent the specific switch button.