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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Math/atan below:

Math.atan() - JavaScript | MDN

Math.atan()

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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 ∊ [ - π 2 ; π 2 ] such that tan ( 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 参数 描述

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

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