인코딩이 ms949일때
보낼때 - encodeURIComponent(category_name)
받을때 - $category_name = iconv("UTF-8", "CP949", rawurldecode($_POST[category_name]));
javascript - (ajax) - php
보낼때 - rawurlencode(iconv("CP949", "UTF-8", "한글"))
받을때 - decodeURIComponent(data.category_name.Text);