월더하기

 

  <script type="text/javascript">
  <!--
console.clear();

var m    = 12;

var term = -3;

var v = m+term;

if ( v <= 0 ) {

           v += 12;

} else if( v > 12 ) {

  v -= 12;

}

//document.writeln('현재 ' + m + "월 " + (term>0?"+":"-") + term + " = " + v +"월");

console.info('현재 ' + m + "월 " + (term>0?"+":"") + term + "개월" + " = " + v +"월");
  //-->
  </script>