如何在 javascript/typescript 中将数字转换为 double 数据类型？

Question

I have one input filed where the user can enter any numbers eg: 12 12.1 12.30 12.34 I have to pass this value in a service call here i can only send the value as number but with 2 decimal points

let a = input //a will be a type of number
let b = a.toFixed(2) //b will be type of string
let c = Number(b) //it will automatically cut unwanted '0'
console.log(c);

EXAMPLE

//input is 12
a=12
b="12.00"
c=12

//input is 12.30
a=12.30
b="12.30"
c=12.3

I want a method, using which i can input a value as a number and output will be number with 2 decimal points.

Answer 1

If you want a number to always display in two decimal places, you can do as below. It will round all the numbers to two decimal places(including doubles).

function twoDecimal(yourNumber){
    return parseFloat(Math.round(yourNumber * 100) / 100).toFixed(2);
}

let x=twoDecimal(10);