Infinity - JavaScript | MDN

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.

全局属性 Infinity 是一个数值,表示无穷大。

尝试一下

const maxNumber = Math.pow(10, 1000); // Max positive number

if (maxNumber === Infinity) {
  console.log("Let's call it Infinity!");
  // Expected output: "Let's call it Infinity!"
}

console.log(1 / maxNumber);
// Expected output: 0

Number.POSITIVE_INFINITY 的数值相同。

Infinity 的属性特性
可写
可枚举
可配置

描述

Infinity全局对象global object)的一个属性,即它是一个全局变量。

Infinity 的初始值是 Number.POSITIVE_INFINITYInfinity(正无穷大)大于任何值。

该值的意义与数学无穷大略有不同。有关详细信息,请参见 Number.POSITIVE_INFINITY

示例

js

console.log(Infinity); /* Infinity */
console.log(Infinity + 1); /* Infinity */
console.log(Math.pow(10, 1000)); /* Infinity */
console.log(Math.log(0)); /* -Infinity */
console.log(1 / Infinity); /* 0 */
console.log(1 / 0); /* Infinity */

规范

Specification
ECMAScript® 2026 Language Specification
# sec-value-properties-of-the-global-object-infinity

浏览器兼容性

参见

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