Formatting numbers in JavaScript

abbreviate_number.js

function abbreviate_number(num)
{
    var sizes = ['', 'thousand', 'million', 'billion', 'trillion', 'quadrillion', 'quintillion', 'sextillion', 'septillion'];
    if (num < 1000) return num;
    var i = parseInt(Math.floor(Math.log(num) / Math.log(1000)));
    return ((i == 0) ? (num / Math.pow(1000, i)) : (num / Math.pow(1000, i)).toFixed(1)) + ' ' + sizes[i]; // use .round() if you don't want the decimal
};

bits_per.js

bits_per = {
    "KiB": 1024,
    "MiB": 1048576,
    "GiB": 1073741824,
    "TiB": 1099511627776,
    "EiB": 1152921504606846976,
    "ZiB": 1180591620717411303424,
    "YiB": 1208925819614629174706176
};

format_bytes.js

/**
 * Convert number of bytes into human readable format
 *
 * @param integer bytes     Number of bytes to convert
 * @return string
 */
function format_bytes(bytes) {
    var sizes = ['bytes', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
    if (bytes == 0) return '';
    if (bytes == 1) return '1 byte';
    var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
    return ((i == 0)? (bytes / Math.pow(1024, i)) : (bytes / Math.pow(1024, i)).toFixed(1)) + ' ' + sizes[i]; // .round
};

format_number.js

function format_number(str)
{
    str += '';
    x = str.split('.');
    x1 = x[0];
    x2 = x.length > 1 ? '.' + x[1] : '';
    var rgx = /(\d+)(\d{3})/;
    while (rgx.test(x1)) {
    x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    return x1 + x2;
};