转换浮点数并保持小数位

Question

I have this values:

var a = 20.0;

document.write(a);                  --> 20
document.write(a.toFixed(2));       --> "20.00"

I want to know if its possible to maintain the decimal places and the variable as float?

Something like this:

20.00

Answer 1

A .0 portion of a number is irrelevant to its value.

Just convert it as you need to when it's time to show the end user.

Answer 2

The kind of floating point numbers used by JavaScript (IEEE-754) don't maintain a "precision" value of that kind (eg, something to say that " 20.00 " has two zeroes after the decimal, but " 20.000 " has three). Trailing zeroes after the decimal point are not significant.

There is a style of number for doing that in some environments (Java has BigDecimal , C# has decimal ), but nothing built into JavaScript does. I believe there's a BigDecimal port to JavaScript out there.