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Tutorial on using logarithmic Math.log() method in JavaScript_Basics

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Release： 2016-05-16 15:54:58

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This method returns the natural logarithm of a number (the base is E). If the value of the number is negative, the return value is always NaN.
Grammar

Math.log( x ) ;

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Here are the details of the parameters:

x : a number.

Return value:

Returns the natural logarithm of a number (base E).

Example:

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

var value = Math.log(10);
document.write("First Test Value : " + value ); 
 
var value = Math.log(0);
document.write("<br />Second Test Value : " + value ); 

var value = Math.log(-1);
document.write("<br />Third Test Value : " + value ); 

var value = Math.log(100);
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

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This will produce the following results:

First Test Value : 2.302585092994046
Second Test Value : -Infinity
Third Test Value : NaN
Fourth Test Value : 4.605170185988092

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Related labels：

javascript math

source：php.cn

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