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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 ~ ~Apple mobile phone Internet access parameter setting method: you enter the mobile phone menu, select "Settings"-"General"-"Cellular Mobile Network"-"Cellular Mobile Data Network" in turn, and enter "CMNET" at the APN of cellular data; Other items need not be filled in or changed. After the setup is successful, turn off the mobile phone and restart it. Warm Tip: If the mobile data traffic package you are using only includes traffic from cmwap access points, change the APN to "cmwap". Please refer to.再耽误，可就走不了了。-Improved Installer Licensing Page; (of no practical use)