## 概述

`Math.LN2` 属性表示 2 的自然对数，约为 0.693：

Math.LN2=ln(2)≈0.693\mathtt{\mi{Math.LN2}} = \ln(2) \approx 0.693

`Math.LN2` 属性的属性特性：
writable | false
enumerable | false
configurable | false

## 描述

由于 `LN2` 是 `Math` 的静态属性，所以应该像这样使用：`Math.LN2`，而不是作为你创建的 `Math` 实例的属性（`Math` 不是构造函数）。

## 示例

### 例子：使用 `Math.LN2`

下面的函数返回 2 的自然对数：

    function getNatLog2() {
       return Math.LN2
    }

    getNatLog2() // 0.6931471805599453

## 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.LN2 | Standard |
ECMAScript 2015 (6th Edition, ECMA-262) Math.LN2 | 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.