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20 a = [1,1,2,3,5,2]; [ 1,2 ] > const _g = new Set(); undefined > a.map(i=>_g.add(i)); [ Set { 1,5 }, Set { 1,5 } ] > _g Set { 1,5 } > Array.from(_g); [ 1,5 ] > 原文链接：https://www.f2er.com/note/421840.html
