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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).In the third step, the Upload.prototype.init method does not need to be changed, but is still responsible for creating DOM nodes related to the follow-up process into the page and starting the event of binding buttons:看着圆脸胖子把菜都尝了一遍，燕南天也放下犹豫，开始吃了一点酒菜。不过，山yīn范家名义上的主人范坤并未因此而招摇，而是低调异常，以至于很多人都奇怪。十个看似素昧平生的社会精英，意外地聚集到一个破旧的郊外别墅。他们必须在六十分钟内完成一场真实的狼人杀游戏。谁是狼人，谁又能活着走出去？How to use daemontoolslite virtual optical drive?