## 概述

`Math.LOG2E` 属性表示以 2 为底数，e 的对数，约为 1.442：

Math.LOG2E=log 2(e)≈1.442\mathtt{\mi{Math.LOG2E}} = \log_2(e) \approx 1.442

`Math.LOG2E` 属性的属性特性：
writable | false
enumerable | false
configurable | false

## 描述

由于 `LOG2E` 是 `Math` 的静态属性，所以应该像这样使用：`Math.LOG2E`，而不是作为你创建的 `Math` 对象的属性（`Math` 不是一个构造函数）。

## 示例

### 例子：使用 `Math.LOG2E`

下面的函数返回以 2 为底数，E 的对数：

    function getLog2e() {
       return Math.LOG2E
    }

    getLog2e() // 1.4426950408889634

## 规范

规范版本 | 规范状态 | 注解
--- | --- | ---
ECMAScript 1st Edition. Implemented in JavaScript 1.0 | Standard | Initial definition.
ECMAScript 5.1 (ECMA-262) Math.LOG2E | Standard |
ECMAScript 2015 (6th Edition, ECMA-262) Math.LOG2E | Standard |

## 浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

- Desktop
- Mobile

Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari
--- | --- | --- | --- | --- | ---
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

## 相关链接

- The `Math` object it belongs to.