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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_VALUE below:

Number.MAX_VALUE - JavaScript | MDN

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Number.MAX_VALUE 静态数据属性表示在 JavaScript 中可表示的最大数值。

function multiply(x, y) {
  if (x * y > Number.MAX_VALUE) {
    return "Process as Infinity";
  }
  return x * y;
}

console.log(multiply(1.7976931348623157e308, 1));
// Expected output: 1.7976931348623157e+308

console.log(multiply(1.7976931348623157e308, 2));
// Expected output: "Process as Infinity"

2¹⁰²⁴ - 1，或大约 1.7976931348623157E+308。

大于 MAX_VALUE 的值表示为 Infinity 并将丢失其实际值。

由于 MAX_VALUE 是 Number 对象的静态属性，你应该始终将其用作 Number.MAX_VALUE，而不是作为一个数字值的属性。

下面的代码对两个数值进行乘法运算。如果结果小于或等于 MAX_VALUE，则调用函数 func1；否则，调用函数 func2。

if (num1 * num2 <= Number.MAX_VALUE) {
  func1();
} else {
  func2();
}

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