숫자에 콤마 찍기

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

소수점 포함

function commaDotFormat(x){
	  var parts = x.toString().split(".");
	  parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",");
	  return parts.join(".");
}