js 판단 문자 입력 개수 검사

<script type="text/javascript">
        // val 
        function getByteLen(val) {
            var len = 0;
            for (var i = 0; i < val.length; i++) {
                if (val[i].match(/[^\x00-\xff]/ig) != null) // 
                    len += 2;
                else
                    len += 1;
            }
            return len;
        }

        // val max 
        function getByteVal(val, max) {
            var returnValue = '';
            var byteValLen = 0;
            for (var i = 0; i < val.length; i++) {
                if (val[i].match(/[^\x00-\xff]/ig) != null)
                    byteValLen += 2;
                else
                    byteValLen += 1;

                if (byteValLen > max)
                    break;

                returnValue += val[i];
            }
            return returnValue;
        }

        $(function() {
            var _area = $('textarea#txtPrizeNote');
            var _info = _area.next();
            var _max = _area.attr('maxlength');
            var _val;
            _area.bind('keyup change', function() { // keyup change 
                if (_info.find('span').size() < 1) {// 
                    _info.append(_max);
                }

                _val = $(this).val();
                _cur = getByteLen(_val);

                if (_cur == 0) {// 0 , maxlength 
                    _info.text(_max);
                } else if (_cur < _max) {// , max-cur
                    _info.text(_max - _cur);
                } else {// 
                    _info.text(0);

                    $(this).val(getByteVal(_val,_max)); // 
                }
            });
        });
    </script>

 // 
 //name ，val ，max 
 function getByteVal(name,val, max) {
     var returnValue = '';
     var byteValLen = 0;
     for (var i = 0; i < val.length; i++) {
         if (val[i].match(/[^\x00-\xff]/ig) != null)
             byteValLen += 2;
         else
             byteValLen += 1;
     }
     if (byteValLen > max){
      return name+ " "+max+" ， ！";
     }else{
      return "";
     }
 }

var deliveryStyle=document.getElementById("softPurchaseInfoVO.deliveryStyle").value;
 var valiLen=getByteVal(" ",deliveryStyle,32);
 if(valiLen!=""){
  alertMsg.warn(valiLen);
  return false;
 }