Rounding a number to exactly two decimal places for currency formatting

问题

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?

回答1:

You can add this to number which you want to set specific format

.toFixed(2)

回答2:

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

来源：https://stackoverflow.com/questions/12402273/rounding-a-number-to-exactly-two-decimal-places-for-currency-formatting