JavaScript 将浮点数显示为小数点后两位

Question

I wanted to display a number to 2 decimal places.

I thought I could use toPrecision(2) in JavaScript.

However, if the number is 0.05 , I get 0.0500 . I'd rather it stay the same.

See it on JSbin .

What is the best way to do this?

I can think of coding a few solutions, but I'd imagine (I hope) something like this is built in?

Answer 1

float_num.toFixed(2);

注意：如果需要， toFixed()将舍入或填充零以满足指定的长度。

Answer 2

You could do it with the toFixed function, but it's buggy in IE . If you want a reliable solution, look at my answer here .

Answer 3

Don't know how I got to this question, but even if it's many years since this has been asked, I would like to add a quick and simple method I follow and it has never let me down:

var num = response_from_a_function_or_something();

var fixedNum = parseFloat(num).toFixed( 2 );

Answer 4

尝试toFixed而不是toPrecision 。

Answer 5

number.parseFloat(2) works but it returns a string.

If you'd like to preserve it as a number type you can use:

Math.round(number * 100) / 100

Answer 6

function round(value, decimals) { return Number(Math.round(value+'e'+decimals)+'e-'+decimals); }

round(1.005, 2); // return 1.01

round(1.004, 2); // return 1 instead of 1.00

The answer is following this link: http://www.jacklmoore.com/notes/rounding-in-javascript/

Answer 7

You could try mixing Number() and toFixed() .

Have your target number converted to a nice string with X digits then convert the formated string to a number.

Number( (myVar).toFixed(2) )

---

See example below:

 var myNumber = 5.01; var multiplier = 5; $('#actionButton').on('click', function() { $('#message').text( myNumber * multiplier ); }); $('#actionButton2').on('click', function() { $('#message').text( Number( (myNumber * multiplier).toFixed(2) ) ); });

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> <button id="actionButton">Weird numbers</button> <button id="actionButton2">Nice numbers</button> <div id="message"></div>

Answer 8

let a = 0.0500
a.toFixed(2);

//output
0.05

Answer 9

The toFixed() method formats a number using fixed-point notation.

and here is the syntax

numObj.toFixed([digits])

digits argument is optional and by default is 0. And the return type is string not number. But you can convert it to number using

numObj.toFixed([digits]) * 1

It also can throws exceptions like TypeError , RangeError

Here is the full detail and compatibility in the browser.

Answer 10

toFixed function is used for restricting float numbers to 2 decimal places in javascript

two_decimal_num = parseFloat(3.14159.toFixed(2));
console.log(two_decimal_num)

Answer 11

There's also the Intl API to format decimals according to your locale value. This is important specially if the decimal separator isn't a dot "." but a comma "," instead, like it is the case in Germany.

Intl.NumberFormat('de-DE').formatToParts(0.05).reduce((acc, {value}) => acc += value, '');

Note that this will round to a maximum of 3 decimal places, just like the round() function suggested above in the default case. If you want to customize that behavior to specify the number of decimal places, there're options for minimum and maximum fraction digits:

Intl.NumberFormat('de-DE', {minimumFractionDigits: 3}).formatToParts(0.05)

Answer 12

with toFixed you can set length of decimal points like this:

let number = 6.1234
number.toFixed(2) // '6.12'

but toFixed returns a string and also if number doesn't have decimal point at all it will add redundant zeros.

let number = 6
number.toFixed(2) // '6.00'

to avoid this you have to convert the result to a number. you can do this with these two methods:

let number1 = 6
let number2 = 6.1234

// method 1
parseFloat(number1.toFixed(2)) // 6
parseFloat(number2.toFixed(2)) // 6.12

// method 2
+number1.toFixed(2) // 6
+number2.toFixed(2) // 6.12

Answer 13

I used this way if you need 2 digits and not string type.

    const exFloat = 3.14159265359;
    
    console.log(parseFloat(exFloat.toFixed(2)));

Answer 14

float_num = parseFloat(float_num.toFixed(2))

Answer 15

I have made this function. It works fine but returns string.

function show_float_val(val,upto = 2){
  var val = parseFloat(val);
  return val.toFixed(upto);
}