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The main question is a bit inaccurate. Is it physical condition, skill condition or application condition?For example, if you use Word to make a test paper, a test paper is usually divided into two or three columns, and the page number should be displayed under each column.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 ~ ~在孩子们的卧室里，生活着五个可爱的瑞奇宝宝。他们性格各异，相处时也会发生些小摩擦；但他们总记得关心彼此、互相帮助，一起面对挑战，共同成长……暖心有爱的故事里还巧妙地融入了认知、社交、艺术、运动等启蒙内容，帮助宝宝开启他们特有的天赋，陪伴他们健康成长。Novice is suitable to use rubber flower balls.$(document). Ready () {黎水跟着骂道：你们这些不要脸的南蛮子，化外刁民，卑鄙无耻，还敢称什么勇士。