Js大数字格式化

// 使用toLocaleString
const num = 1234567890;
console.log(num.toLocaleString()); // 输出: "1,234,567,890"

// 自定义函数
function formatNumberWithCommas(num) {
  return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
console.log(formatNumberWithCommas(1234567890)); // 输出: "1,234,567,890"

const num = 12345678901234567890;
console.log(num.toExponential()); // 输出: "1.2345678901234568e+19"

const bigNum = BigInt("123456789012345678901234567890");
console.log(bigNum); // 输出: 123456789012345678901234567890n

// 加法运算
const anotherBigNum = BigInt("987654321098765432109876543210");
console.log(bigNum + anotherBigNum); // 输出: 1111111110111111111011111111100n

const num = 9007199254740993; // 超出Number精度范围
console.log(num === 9007199254740993); // 输出: false

const bigNum = BigInt("9007199254740993");
console.log(bigNum === 9007199254740993n); // 输出: true