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明心慌慌张张地爬起来，抹着眼泪出去了。尹将军一直期待着这一天的到来，沛公刘邦从鸿门回去之后，一直忐忑不已，等待着项羽的处置。虞子期和项庄，以及一些以死明志的将领随即横剑自刎，追随项羽而去。明天晚上你想吃什么？徐风在生鲜区挑选着。哈利·波特（丹尼尔·雷德克里夫饰）结束了假期，即将回到霍格沃兹继续学习魔法。一个叫多比的家养小精灵警告哈利不要回到霍格沃兹，否则会陷入极大的危险。哈利没有听从多比的劝告，回到了霍格沃兹。很快，霍格沃兹发生了一连窜怪事:接二连三出现学生被石化，一直找不出原因。而哈利总能听到一种奇怪的声音，从墙壁里传出来。传说，霍格沃兹有一个密室，里面记录着伏地魔年轻时的秘密，只有斯莱特林的人才能打开密室。哈利偶然发现自己能听懂蛇说话，一时传闻是哈利打开了密室。难道多比所指的危险就隐藏在密室？Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~