[j0hnik]

Много буков

проверять выигрыш можно проще

combo = [[0,1,2],[3,4,5],[6,7,8],[0,3,6],[1,4,7],[2,5,8],[0,4,8],[2,4,6]];
var win=(a)=>combo.find(el=>el.every((el)=>a.includes(el)));