JavaScript: The Definitive Guide, Fourth Edition

Name

Number.toFixed( ) — format a number using fixed-point notation

Availability

JavaScript 1.5; JScript 5.5, ECMAScript v3

Synopsis

                  number.toFixed(digits)

Arguments

digits

The number of digits to appear after the decimal point; this may be a value between 0 and 20, inclusive, and implementations may optionally support a larger range of values. If this argument is omitted, it is treated as 0.

Returns

A string representation of number that does not use exponential notation and has exactly digits digits after the decimal place. The number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. If number is greater than 1e+21, this method simply calls Number.toString( ) and returns a string in exponential notation.

Throws

RangeError

If digits is too small or too large. Values between 0 and 20, inclusive, will not cause a RangeError. Implementations are allowed to support larger and smaller values as well.

TypeError

If this method is invoked on an object that is not a Number.

Example

var n = 12345.6789;
n.toFixed(  );            // Returns 12346: note rounding, no fractional part
n.toFixed(1);             // Returns 12345.7: note rounding
n.toFixed(6);             // Returns 12345.678900: note added zeros
(1.23e+20).toFixed(2);    // Returns 123000000000000000000.00
(1.23e-10).toFixed(2)     // Returns 0.00

See Also

Number.toExponential( ), Number.toLocaleString( ), Number.toPrecision( ), Number.toString( )