Javascript Comma

1. 콤마 찍기

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

또는

function comma(str) {
    return str.toString().replace(/(\d)(?=(?:\d{3})+(?!\d))/g, '$1,');
}

2. 콤마풀기

function uncomma(str) {
    return str.toString().replace(/[^\d]+/g, '');
}

3. input box에서 사용자 입력시 바로 콤마를 찍어주기

function inputNumberFormat(obj) {
    obj.value = comma(uncomma(obj.value));
}
 
//<input type="text" onkeyup="inputNumberFormat(this)" />

출처

http://stackoverflow.com/questions/2901102/how-to-print-a-number-with-commas-as-thousands-separators-in-javascript

http://blog.munilive.com/javascript-comma-uncomma/