Math.atan()

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.

概述

Math.atan() 函数返回一个数值的反正切(以弧度为单位),即:

Math.atan(x)=arctan(x)= the unique y[-π2;π2]such thattan(y)=x\mathtt{\operatorname{Math.atan}(x)} = \arctan(x) = \text{ the unique } ; y \in \left[-\frac{\pi}{2}; \frac{\pi}{2}\right] , \text{such that} ; \tan(y) = x

语法

Math.atan(x)

参数

x

一个数值

描述

atan 返回一个 -π2-\frac{\pi}{2}π2\frac{\pi}{2} 弧度之间的数值。

由于 atanMath 的静态方法,所以应该像这样使用:Math.atan(),而不是作为你创建的 Math 实例的方法。

示例

示例:使用 Math.atan

js
Math.atan(1); // 0.7853981633974483
Math.atan(0); // 0

规范

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

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
atan

Legend

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Full support
Full support

参见