Answers for "how to control the number of decimals in js"

js number with four decimal places

var myNumber = 2;

myNumber.toFixed(2); //returns "2.00"
myNumber.toFixed(1); //returns "2.0"

how to get decimal value in js

const number // Some Decimal Number
const decimal  = number - Math.floor(number)
//implementation
const number = 3.78;
const decimal = 3.78 - (Math.floor(3.78)) // Math.floor(3.78) returns 3
// decimal is 0.78