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Using the square root sqrt() method in JavaScript_Basics

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Release： 2016-05-16 15:54:51

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This method returns the square root of a number. If the value of the number is negative, the square root returns NaN.
Grammar

Math.sqrt( x ) ;

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Here are the details of the parameters:

x: a number

Return value:

Returns the sine of a number.

Example:

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

var value = Math.sqrt( 0.5 );
document.write("First Test Value : " + value ); 
 
var value = Math.sqrt( 81 );
document.write("<br />Second Test Value : " + value ); 

var value = Math.sqrt( 13 );
document.write("<br />Third Test Value : " + value ); 

var value = Math.sqrt( -4 );
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

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This will produce the following results:

First Test Value : 0.7071067811865476
Second Test Value : 9
Third Test Value : 3.605551275463989
Fourth Test Value : NaN

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Related labels：

javascript sqrt

source：php.cn

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