1var a = new Set([1,2,3]);
2var b = new Set([1,3,2]);
3
4alert(eqSet(a, b)); // true
5
6function eqSet(as, bs) {
7    if (as.size !== bs.size) return false;
8    for (var a of as) if (!bs.has(a)) return false;
9    return true;
10}