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Math.atan()

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} 到 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

例子:使用 Math.atan

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

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.atan
Standard  
ECMAScript 6 (ECMA-262)
Math.atan
Release Candidate  

浏览器兼容性

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)

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