Mozilla Developer Network
- Math
- Methods
- Math.abs()
- Math.acos()
- Math.acosh()
- Math.asin()
- Math.asinh()
- Math.atan()
- Math.atan2()
- Math.atanh()
- Math.cbrt()
- Math.ceil()
- Math.cos()
- Math.cosh()
- Math.exp()
- Math.expm1()
- Math.floor()
- Math.fround()
- Math.hypot()
- Math.imul()
- Math.log()
- Math.log10()
- Math.log1p()
- Math.log2()
- Math.max()
- Math.min()
- Math.pow()
- Math.random()
- Math.round()
- Math.sign()
- Math.sin()
- Math.sinh()
- Math.sqrt()
- Math.tan()
- Math.tanh()
- Math.trunc()
- Properties
Summary
The Math.atan() function returns the arctangent (in radians) of a number.
Syntax
Math.atan(x)
Parameters
-
x - A number.
Description
The atan method returns a numeric value between -pi/2 and pi/2 radians.
Because atan is a static method of Math, you always use it as Math.atan(), rather than as a method of a Math object you created.
Examples
Example: Using Math.atan
The following function returns the arctangent of the variable x:
function getAtan(x) {
return Math.atan(x);
}
If you pass getAtan the value 1, it returns 0.7853981633974483; if you pass it the value .5, it returns 0.4636476090008061.
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition. Implemented in JavaScript 1.0 | Standard | Initial definition. |
| ECMAScript Language Specification 5.1th Edition (ECMA-262) | Standard | |
| ECMAScript Language Specification 6th Edition (ECMA-262) | Draft |
Browser compatibility
| 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) |
See also
- The
Mathobject it belongs to. Math.acos()Math.asin()Math.atan2()Math.cos()Math.sin()Math.tan()