[javascript] 한글자씩 입력

<script>
 
    function hh(gb){
        var data = document.getElementById('g01').value
            if (data.length == '2'){
            document.getElementById('g02').focus();
        }
    }
 
</script>
 
<input type=text id=g01 value="" onkeyup="hh(1);">
<input type=text id=g02 value="">
<input type=text id=g03 value="">
<input type=text id=g04 value="">
<input type=text id=g05 value="">