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How to calculate log10 (base-10 logarithm) in JavaScript



315 views
asked Dec 15, 2015 by avibootz
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2 Answers

0 votes 
<!DOCTYPE html>
<html>
<head>  
</head>
 
<body>
<p id="calc"></p>
<script>
function _log10(n) 
{
    document.getElementById("calc").innerHTML =  Math.log(n) / Math.LN10;
    //document.getElementById("calc").innerHTML =  Math.log(n) / Math.log(10);
}
</script>
<input type="button" value="log10(123)" onclick="_log10(123)" />
<input type="button" value="log10(1234)" onclick="_log10(1234)" />
<input type="button" value="log10(12345)" onclick="_log10(12345)" />

 
</body>
</html>
<!-- 
run:

2.0899051114393976
3.091315159697223
4.091491094267951
-->

 



answered Dec 15, 2015 by avibootz
edited Dec 15, 2015 by avibootz
0 votes 
<!DOCTYPE html>
<html>
<head>  
</head>
  
<body>
<p id="calc"></p>
<script>
function _log10(n) 
{
    document.getElementById("calc").innerHTML =  parseInt(Math.log(n) / Math.LN10);
    //document.getElementById("calc").innerHTML =  parseInt(Math.log(n) / Math.log(10));
}
</script>
<input type="button" value="log10(123)" onclick="_log10(123)" />
<input type="button" value="log10(1234)" onclick="_log10(1234)" />
<input type="button" value="log10(12345)" onclick="_log10(12345)" />
 
  
</body>
</html>

<!-- 
run:

2
3
4
-->

 



answered Dec 15, 2015 by avibootz
edited Dec 15, 2015 by avibootz

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