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Detailed explanation of the use of acos() method in JavaScript_Basic knowledge

WBOY
WBOYOriginal
2016-05-16 15:55:051055browse

This method returns the arc cosine of radians. The ACOS method returns the value of 0 and PI for radians between x-1 and 1. If the number value is outside this range, NaN is returned.
Grammar

Math.acos( x ) ;

Here are the details of the parameters:

  • x : a number

Return value:

  • Returns the arc cosine of some number of radians.

Example: 

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

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

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

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

This will produce the following results: 

First Test Value : 3.141592653589793
Second Test Value : 1.5707963267948965
Third Test Value : NaN
Fourth Test Value : NaN

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