Home  >  Article  >  Web Front-end  >  A brief discussion on the use of Math.atan() method in JavaScript_Basic knowledge

A brief discussion on the use of Math.atan() method in JavaScript_Basic knowledge

WBOY
WBOYOriginal
2016-05-16 15:55:021631browse

This method returns the arctangent of radians. The atan method returns a number between -pi/2 and π/2 radians.
Grammar

Math.atan( x ) ;

Here are the details of the parameters:

  • x : a number

Return value:

  • Returns the arctangent of a number in radians

Example:

<html>
<head>
<title>JavaScript Math atan() Method</title>
</head>
<body>
<script type="text/javascript">

var value = Math.atan(-1);
document.write("First Test Value : " + value ); 
 
var value = Math.atan(.5);
document.write("<br />Second Test Value : " + value ); 

var value = Math.atan(30);
document.write("<br />Third Test Value : " + value ); 

var value = Math.atan("string");
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

This will produce the following results:

First Test Value : -0.7853981633974483
Second Test Value : 0.4636476090008061
Third Test Value : 1.5374753309166493
Fourth Test Value : NaN 

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn