JSFiddle - React, Tailwind, and code Playground

JavaScript

function ConverterNumeroParaOctal(num)
{
    var result = "";
    while (num > 0){
        result = "01234567"[num % 8] + result;
        num = Math.floor(num / 8);
    }
    return result;
}

document.write(ConverterNumeroParaOctal(8) + "<br>");
document.write(ConverterNumeroParaOctal(64) + "<br>");