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46 方法，reduce和indexOf distinctArrarr ...arr prevcurrindexarray ...prev curr prev.curr prev arr console.distinctArrarr .. .. searchElement fromIndex index fromIndex fromIndex k length . k length k k = fromIndex k searchElement index k index .. .. callback initialValue prevIoUs initialValue k length . initialValue prevIoUs k callback k k length k .k prevIoUs callbackprevIoUs k k prevIoUs 原文链接：https://www.f2er.com/note/421905.html
