用JavaScript处理价格和取整 [英] Dealing with prices and rounding in Javascript

问题描述

所以，众所周知， 0.1 + 0.2 等于 0.30000000000000004 。

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

我有一个可以在卖点用来收钱的应用程序，我不想处理浮点运算的噩梦。我所看到的，我的选择是

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），使用整数并将价格作为美分/便士，在那儿做数学，然后然后除以100得到美元/磅的成本

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），使用小数库对数字进行精确的数学计算

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

我正在使用react.js和webpack。有生产经验的人有什么建议吗？我倾向于选项a。

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

推荐答案

执行所有货币操作（以及任何具有固定的小数位数）作为整数运算，然后将该值转换为小数以进行显示。仅在精度至关重要且小数位数随数字而变化的情况下，才使用十进制库。

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.

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