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27% of the people have no ideal and no goal in life.5. The exclusive lounge is very considerate.她轻声说完，从腰间解下一根腰带，小心地用刀割开，从里面掏出一小包药粉，细细地抹在脸上，俯身对着河水清洗。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 ~ ~不知是谁，把刀往地上一丢，转身便逃。