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事讲述了一只古怪、快乐、热情的兔子 Molang，和一只害羞、谨慎、情绪化的小鸡 Piu Piu 之间的关系，这个动画系列剧用非常温暖的方式探索了 Molang 和 Piu Piu 的日常生活。Whether it is file uploading, music or video players, some obvious state distinctions can be found. For example, there are several states in the file upload program: scanning, uploading, pausing, uploading successfully and uploading failed. The music player can be divided into several states: loading, playing, pausing and playing after. When clicking the same button, the behavior in upload and pause states is different, and their style class is also different.哆啦A梦和大雄去到了太阳王国——玛雅王国，在那里遇上的玛雅王子，不知怎的，意和大雄长得一模一样。于是大雄便和王子交换衣服，掉换换身份，在对方的世界生活…The update supports version 4.3. 0 d of 4.3;哈利在德思礼的家里，焦急地等待校长的来访，邓布利多带他到一个神秘的地方，告诉他和哈瑞斯制服伏地魔的方法。在魔法学校，哈利、罗恩和赫敏继续着三人小组的学习；斯内普教授仍时不时找哈利的麻烦。Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.