`Number.EPSILON` 属性表示 1 与`Number`可表示的大于 1 的最小的浮点数之间的差值。

你不必创建一个 `Number` 对象来访问这个静态属性（直接使用 `Number.EPSILON`）。

`Number.EPSILON` 属性的属性特性：
writable | false
enumerable | false
configurable | false

## 描述

`EPSILON` 属性的值接近于 `2.2204460492503130808472633361816E-16`，或者 `2-52。`

## 示例

### 测试是否相等

    x = 0.2;
    y = 0.3;
    z = 0.1;
    equal = (Math.abs(x - y + z) < Number.EPSILON);

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 2015 (6th Edition, ECMA-262) Number.EPSILON | Standard | 最初定义
ECMAScript Latest Draft (ECMA-262) Number.EPSILON | Draft |

## 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) | 25.0 (25.0) | 未实现 | (Yes) | 9

Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
Basic support | 未实现 | 未实现 | 25.0 (25.0) | 未实现 | 未实现 | 9

## 相关链接

- `Number`