fractionDigits

Optional. Number of digits after the decimal point. Must be in the range 0 – 20, inclusive.

The toFixed method returns a string representation of a number in fixed-point notation. The string contains one digit before the significand's decimal point, and must contain fractionDigits digits after it.

If fractionDigits is not supplied or undefined, the toFixed method assumes the value is zero.

Version 5.5

Reference