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Introduction to the use of arcsine function Math.asin() in JavaScript_Basic knowledge

WBOY
WBOYOriginal
2016-05-16 15:55:041907browse

This method returns the arcsine of the number in radians. The ASIN method returns a value between -1 and 1, x-pi/2 and PI/2 radians. If the number value is outside this range, NaN is returned.
Grammar

Math.asin( x ) ;

Here are the details of the parameters:

  • x : a number

Return value:

Returns the arcsine of a number in radians.
Example: 

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

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

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

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

This will produce the following results: 

First Test Value : -1.5707963267948965
Second Test Value : 0
Third Test Value : NaN
Fourth Test Value : NaN

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