JavaScript 1.0; JScript 1.0; ECMAScript v1
x
Any numeric value or expression greater than zero.
The natural logarithm of x.
Math.log( ) computes log
3
x the natural logarithm of its argument. The argument must be greater than zero.
You can compute the base-10 and base-2 logarithms of a number with these formulas:
log10
x = log10
e ·loge
x
log2
x = log2
e ·loge
x
These formulas translate into the following JavaScript functions:
function log10(x) { return Math.LOG10E * Math.log(x); }
function log2(x) { return Math.LOG2E * Math.log(x); }