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The status switching of file upload is much more complicated than that of file upload. The process of controlling file upload requires two node buttons, the first is used to pause and continue upload, and the second is used to delete files.话虽如此，但是坐在对面的李左车眉头不禁微微一皱，这件事情上他不由不一样的看法。Eggplant secret medicineB) 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).His short adventure for their help: Lanlan (plant-dyeing team head at our shop), Lekui (text and photograph) and Solav (translation and revision)Copper-clad steel raw materials have poor softness, overall stiffness and short limited transmission interval, and can be simply touched by magnets to attract each other.She is willing to stay away from her parents and relatives just to have children with you.