【Html代码】

<table> <tr> <td width="150">短信内容：</td> <td> <textarea name="message" cols="96" rows="5" onKeyDown="textCounter(message,remLen,65);" onKeyUp="textCounter(message,remLen,65);"></textarea> <td> </tr> <tr><td></td> <td>您还可以输入:<input name="remLen" type="text" value="65" size="5" readonly="readonly">个字符,每条短信最大允许输入<strong>65</strong>个字符</td> </tr> </table>

【对应的js代码】

<script> function textCounter(field, countfield, maxlimit) { if (field.value.length > maxlimit) field.value = field.value.substring(0, maxlimit); else countfield.value = maxlimit - field.value.length; } </script>