将数字四舍五入到精确到小数点后两位以进行货币格式设置

Question

I need to round to two decimal places for currency.

Both

Math.round(num*Math.pow(10,2))/Math.pow(10,2)

and

Math.round(num*Math.pow(10,2))/Math.pow(10,2)

work except it cuts any trailing zero's off so I get 29.9 instead of 29.90 .

What is the best way around this?

Answer 1

您可以将此添加到要设置特定格式的数字

.toFixed(2)

Answer 2

(Math.round(num*Math.pow(10,2))/Math.pow(10,2)).toFixed(2)

Answer 3

It makes sense to think about it as a total amount of cents. 19.999 = 1999.9 cents, the 3rd decimal does not matter you cant pay it anyway.

This makes sense:

function convertToMoney(val){
    return (Math.floor(val*100).toFixed(0)/100).toFixed(2);
}

Answer 4

I am using this, seems to be ok

Math.round(x * 100)/100

Its look like shortest