Converting floating point numbers to integers, rounding to 2 decimals in JavaScript

问题

What's the best way to perform the following conversions in JavaScript? I have currencies stored as floats that I want rounded and converted to integers.

1501.0099999999999909 -> 150101

12.00000000000001 -> 1200

回答1:

One way to do this is to use the toFixed method off a Number combined with parseFloat.

Eg,

var number = 1501.0099999999999909;
var truncated = parseFloat(number.toFixed(5));
console.log(truncated);

toFixed takes in the number of decimal points it should be truncated to.

To get the output you need, you would only need `toFixed(2)' and multiple the result by 100.

Eg,

var number = 1501.0099999999999909;
var truncated = parseFloat(number.toFixed(2)) * 100;
console.log(truncated);

来源：https://stackoverflow.com/questions/30249706/converting-floating-point-numbers-to-integers-rounding-to-2-decimals-in-javascr