Update(2019-08-19): BigInt is now part of Firefox and Chrome; you no longer need a library:
const bigInt1 = 1111111111111111111111111111111n;
const bigInt2 = BigInt("1111111111111111111111111111111")
console.log((bigInt1 + bigInt2)+"")
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…