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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 ~ ~There is a passage in the video, which deeply hurt me.《雷霆扫毒》毒品调查科行动组高级督察向荣（苗侨伟饰）嫉恶如仇，与情报组高级督察韦世乐（林峯饰）亦师亦友，合作无间，为警队屡破毒案。世乐在一次缉毒行动中，发现蛛丝马迹，向荣极有可能是勾结毒犯的神秘黑警。世乐开始暗中调查向荣，加上心术不正的行动组总督察潘学礼（黄智贤饰）从中挑拨，多年兄弟连番角力，矛盾重重。另一方面，世乐因调查行动认识线人陈家碧（徐子珊饰），两人暗生情愫，但家碧出身低微，自卑感作祟，刻意逃情，并让爱予一直暗恋世乐的新扎师妹高希璇（官恩娜饰），三人之间有着微妙的感情关系。忍痛让爱的家碧最后走上不归路，选择投向黑帮大佬的怀抱，成为新一代毒后，贩运毒品，挑战警队。世乐痛心疾首，与向荣联手，跟家碧展开一幕幕的毒战。4. Os.remove ()--Deletes the specified fileYou can inquire about the contact information of this brand's after-sales service centers in various places, please click here to inquire.......Especially at the arch of the foot, 260D rubber bands are used to realize the compression function, which makes the arch of the foot more comfortable and avoids blisters caused by friction.First, add a desktop clock: turn on the mobile phone, knead with two fingers in the lower left corner and upper right corner of the mobile phone screen at the same time-click the desktop plug-in-select "Clock" to add a clock to the desktop.