How to convert BigInt to Number in JavaScript?

问题

I found myself in the situation where I wanted to convert a BigInt value to a Number value. Knowing that my value is a safe integer, how can I convert it?

回答1:

Turns out it's as easy as passing it to the Number constructor:

const myBigInt = BigInt(10);  // of course, `10n` also works
const myNumber = Number(myBigInt);

回答2:

You can use parseInt or Number

const large =  BigInt(309);
const b = parseInt(large);
console.log(b);
const n = Number(large);
console.log(n);

来源：https://stackoverflow.com/questions/53970655/how-to-convert-bigint-to-number-in-javascript