코드 - html <span class="comma">1234567890000000</span> - script $(window).on('load', function(){ $('.comma').each(function(){ var txt = $(this).text(); $(this).html(txt.replace(/,/g, '')); var len = $(this).text().length; for (i = 0; i < len; i ++){ $(this).eq(i).text(commaNum($(this).eq(i).text())); } }); function commaNum(num){ var len, point, str; num = num + ''; point = num.length % 3 len = num.length; str = num.substring(0, point); while (point < len){ if (str != '') str += ','; str += num.substring(point, point + 3); point += 3; } return str; } });