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

Number.NaN - JavaScript | MDN

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Number.NaN 静态数据属性表示非数字值，等同于 NaN。有关 NaN 的行为的更多信息，请参阅全局属性的描述。

function clean(x) {
  // eslint-disable-next-line use-isnan
  if (x === Number.NaN) {
    // Can never be true
    return null;
  }
  if (isNaN(x)) {
    return 0;
  }
}

console.log(clean(Number.NaN));
// Expected output: 0

数字值 NaN。

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

function sanitize(x) {
  if (isNaN(x)) {
    return Number.NaN;
  }
  return x;
}

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