## 概述

`Math.sinh()` 函数返回一个数字(单位为角度)的双曲正弦值.

## 语法

    Math.sinh(x)

### 参数

`x`
  任意数字 (单位为度).

## 描述

双曲正弦的图像如下:

## 示例

    Math.sinh(0)      // 0
    Math.sinh(1)      // 1.1752011936438014
    Math.sinh("-1")   // -1.1752011936438014
    Math.sinh("foo")  // NaN

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 2015 (6th Edition, ECMA-262) Math.sinh | Standard | Initial defintion

## Polyfill

该函数可以使用 `Math.exp()``函数来实现`:

    function sinh(x){
        return  (Math.exp(x) - Math.exp(-x)) / 2);
    }

## 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 | 未实现 | 25 (25) | 未实现 | 未实现 | 未实现

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) | 未实现 | 未实现 | 未实现

## 相关链接

- `Math.acos()`
- `Math.asin()`
- `Math.atan()`
- `Math.atan2()`
- `Math.cos()`
- `Math.tan()`