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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 ~ ~In web development, Picture preloading is a common technique, If you set the src attribute directly to the img tag node, If the picture is larger, Or if the network speed is relatively slow, Before the picture is loaded, The picture will be a blank scene for a period of time. This is not good for the user experience, so at this time we can use a loading loading picture as a placeholder to prompt the user that the picture is being loaded before the picture is loaded. After the picture is loaded, we can directly assign a value to the picture. The following code is as follows when we do not use proxy mode to preload pictures:板栗生气地说道：不在地下烧了吃，他还敢带出去？这么大的乌龟，他能带得出去么？他倒心细，吃完了，把壳藏在这。……(未完待续。特工英雄007詹姆斯•邦德（皮尔斯•布鲁斯南 Pierce Brosnan 饰）这次在北朝鲜发现了一位世界级的媒体大亨——盖斯特维的阴谋诡计。盖斯特维妄图研制一枚类似于第二颗太阳那样的卫星来挑起全球战争，进而达到他控制地球的企图。007当然不会允许盖斯特维的阴谋得逞，于是在北朝鲜展开了调查。经过调查，007发现盖斯特维的真实身份，那是经过整容后改头换面的原北朝鲜领导人Zao。现在，007必须抓紧时间找到Zao，制止他的阴谋以阻止战争的全面爆发。007真的能成功吗？Public void operation () {中国沿海某大城市突然发生一连串谋杀流血事件，公安局长命令刑警特别行动小队立即出动侦破，队长华飞龙与队员余风、杨英、何强、姜雪乔装成保险公司员工，神出鬼没私查暗访，将杀人凶手一一缉拿到案，并挖出一个庞大的制毒贩毒集团。初战告捷，广播电台大院又响起枪声，多名男子被枪击伤，一名副台长下落不明。特警队奉命进驻电台，与风姿绰约的节目主持人联手行动，巧妙地引出持枪伤人的痴情狂，腐败分子杀人灭口谋害副台长的罪行也水落石出。