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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 ~ ~正无法可想，忽见板栗过来了，心下一喜，暗道这下好了。陈启拨通了吕文心的电话。Next, we will listen to the onchange event in the drop-down box of colorSelect and the oninput event in the numberInput input box respectively, and then make corresponding processing in these two events.