var removeComma = function(str){
    return str.replace(/,/g, '').trim();
}

var addComma = function(str){
    return str.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

Add / Remove comma for number in the thousands. Ex: 1,000

Useful for grabbing input values to format then display, remove the comma and convert back to number to do math.

Adding/remove commas in digits

js, number

JavaScript