JavaScript 1.0; JScript 1.0; ECMAScript v1
x
A numeric value greater than or equal to zero.
The square root of x. Returns NaN if x is less than zero.
Math.sqrt( ) computes the square root of a number. Note, however, that you can compute arbitrary roots of a number with Math.pow( ). For example:
Math.cuberoot = function(x){ return Math.pow(x,1/3); }
Math.cuberoot(8); // Returns 2