Export (0) Print
Expand All

Math.log Function (JavaScript)

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

Math.log(number)

number

A number.

If number is positive, this function returns the natural logarithm of the number. If number is negative, this function returns NaN. If number is 0, this function returns -Infinity.

The following code shows how to use this function.

var numArr = [ 45.3, 69.0, 557.04, 0.222 ];

for (i in numArr) {
    document.write(Math.log(numArr[i]));
    document.write("<br/>");
}

// Output: 
// 3.8133070324889884
// 4.23410650459726
// 6.322637050634291
// -1.5050778971098575

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

Applies To: Math Object (JavaScript)

Show:
© 2014 Microsoft