How to use 'add comma to number javascript' in JavaScript

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intComma: function intComma(number) {
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  var decimals = arguments.length <= 1 || arguments[1] === undefined ? 0 : arguments[1];
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  return Humanize.formatNumber(number, decimals);
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},

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