js监听鼠标事件控制textarea输入字符串的个数

<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>

<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>