Infinity
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.
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
值
与 Number.POSITIVE_INFINITY
的数值相同。
Infinity 的属性特性 | |
---|---|
可写 | 否 |
可枚举 | 否 |
可配置 | 否 |
描述
Infinity
是全局对象(global object)的一个属性,即它是一个全局变量。
Infinity
的初始值是 Number.POSITIVE_INFINITY
。Infinity
(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® 2025 Language Specification # sec-value-properties-of-the-global-object-infinity |
浏览器兼容性
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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Infinity |
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- Full support
- Full support
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