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

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Release： 2016-05-16 15:55:02

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

Math.atan( x ) ;

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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>

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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

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Related labels：

javascript math

source：php.cn

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