textarea maxlength 제한하기

http://cflove.org/2010/05/simple-jquery-textarea-maxlength-function.cfm 참조 

<script type='text/javascript' src='http://cflove.org/js/jquery-1.4.2.min.js'></script> <script type="text/javascript">   $("document").ready(function() {    $('textarea[maxlength]').live('keyup change', function() {     var str = $(this).val()     var mx = parseInt($(this).attr('maxlength'))     if (str.length > mx) {      $(this).val(str.substr(0, mx));      return false;      }    })   })  </script>    <textarea maxlength="50" style="width:400px; height:50px"></textarea>  [출처] textarea maxlength 제한하기|작성자 koalagon