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Finally, let's do some testing work:Reference: Baidu Encyclopedia-iPhone1. Practical Website57 岁的失业男子亚兰·德兰波受到一个诱人职缺吸引，但当他发现自己竟是残酷企业游戏中的一颗棋子，事态开始急转直下。胡镇心中突突地跳着，不知今日之事如何了结，忽然瞥见洪霖神色，心中一动，急忙大叫道：我看见葫芦戴一顶绿帽子，说笑了两句，他就恼羞成怒，跟我动手……不要脸。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 ~ ~