Display numbers up to two decimals places without trailing zeros

问题

In my code I will be accepting multiple values, for example:

8.7456
8.7
8

and I need to have them appear as

8.74
8.7
8

i.e. display up to two decimal place.

I understand that .toFixed(2) will help me with the first value, but on the 2nd and 3rd value there will be trailing zeroes that I do not want.

How to produce my desired results?

回答1:

Use Number.toFixed to round the number up to two digits and format as a string. Then use String.replace to chop off trailing zeros:

(8.7456).toFixed(2).replace(/\.?0+$/, ""); // "8.75"
(8.7).toFixed(2).replace(/\.?0+$/, "");    // "8.7"
(8).toFixed(2).replace(/\.?0+$/, "");      // "8"

回答2:

Multiply by 100, floor, divide by 100.

var n = 8.7456;
var result = Math.floor(n * 100) / 100; // 8.74

Edit: if you’re looking at this question after the fact, this is probably not what you want. It satisfies the odd requirement of having 8.7456 appear as 8.74. See also the relevant comment.

来源：https://stackoverflow.com/questions/10215770/display-numbers-up-to-two-decimals-places-without-trailing-zeros