Dealing with prices and rounding in Javascript [cl

问题:

So, as we all know, 0.1 + 0.2 is equivalent to 0.30000000000000004.

I've got an application which will be used at a point of sell to collect money, and I don't want to deal with the nightmare of floating point arithmetic. My options, as I see them, are

a) using integers and dealing with prices as Cents/Pence, doing the math there, and then dividing by 100 to get the cost in Dollars/Pounds

b) using a Decimal library to do accurate math on the numbers

I'm using react.js and webpack. Anybody with production experience have any advice? I'm leaning toward option a.

回答1:

It is an established convention to do all currency operations (and any operation that has a fixed number of decimal places for that matter) as integer operations and convert that value to decimal for display. Use a decimal library only if accuracy is vital and the number of decimal places varies from number to number.