Math.asinh()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Math.asinh() 靜態方法回傳數字的反雙曲正弦值。也就是說,

𝙼𝚊𝚝𝚑.𝚊𝚜𝚒𝚗𝚑(𝚡)=arsinh(x)=the unique y such that sinh(y)=x=ln(x+x2+1)\begin{aligned}\mathtt{\operatorname{Math.asinh}(x)} &= \operatorname{arsinh}(x) = \text{the unique } y \text{ such that } \sinh(y) = x \\&= \ln\left(x + \sqrt{x^2 + 1}\right)\end{aligned}

嘗試一下

console.log(Math.asinh(1));
// Expected output: 0.881373587019543

console.log(Math.asinh(0));
// Expected output: 0

console.log(Math.asinh(-1));
// Expected output: -0.881373587019543

console.log(Math.asinh(2));
// Expected output: 1.4436354751788103

語法

js
Math.asinh(x)

參數

x

一個數字。

回傳值

x 的反雙曲正弦值。

描述

由於 asinh()Math 的靜態方法,你必須使用 Math.asinh() 來呼叫它,而非呼叫你建立的 Math 物件的方法(Math 並非建構子)。

範例

使用 Math.asinh()

js
Math.asinh(-Infinity); // -Infinity
Math.asinh(-1); // -0.881373587019543
Math.asinh(-0); // -0
Math.asinh(0); // 0
Math.asinh(1); // 0.881373587019543
Math.asinh(Infinity); // Infinity

規範

Specification
ECMAScript® 2025 Language Specification
# sec-math.asinh

瀏覽器相容性

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Chrome
Edge
Firefox
Opera
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Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
asinh

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Full support
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