Number.MAX_VALUE

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

尝试一下

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

Number.MAX_VALUE 的属性特性
可写
可枚举
可配置

描述

大于 MAX_VALUE 的值表示为 Infinity 并将丢失其实际值。

由于 MAX_VALUENumber 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。

示例

使用 MAX_VALUE

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

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

规范

Specification
ECMAScript® 2025 Language Specification
# sec-number.max_value

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
MAX_VALUE

Legend

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Full support
Full support

参见