Infinity
Infinity
全局属性 Infinity是一个数值，表示无穷大。
| Property attributes of Infinity |
|:----|
| Writable | no |
| Enumerable | no |
| Configurable | no |
语法
Infinity
描述
Infinity 是全局对象（global object）的一个属性，即它是一个全局变量。
在 ECMAScript 5 的规范中， Infinity 是只读的（实现于 JavaScript 1.8.5 / Firefox 4）。
示例
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 */
规范
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.3 |
| ECMAScript 5.1 (ECMA-262)The definition of 'Infinity' in that specification. | Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'Infinity' in that specification. | Standard | |
| ECMAScript Latest Draft (ECMA-262)The definition of 'Infinity' in that specification. | Draft | |
浏览器兼容性
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
