js工具类

<tr>
  <th>适用范围说明：</th>
  <td colspan="5"> 
      <textarea class="text" id="dtoinstrutcation" name="productScopeDTO.instrutcation" wrap="PHYSICAL" Null="true" rows="2" cols="75" 
      onKeyDown="gbcount(this.form.dtoinstrutcation,this.form.total02,this.form.used02,this.form.remain02);" 
      onKeyUp="gbcount(this.form.dtoinstrutcation,this.form.total02,this.form.used02,this.form.remain02);"></textarea>
    <p>最多字数:
        <input disabled maxLength="4" id="dtototal02" name="total02" notNull="true" size="4" value="500" class="inputtext">已用字数:
        <input disabled maxLength="4" id="dtoused02" name="used02" notNull="true" size="4" value="0" class="inputtext">剩余字数:
        <input disabled maxLength="4" id="dtoremain02" name="remain02" notNull="true" size="4" value="500" class="inputtext">
    </p>
  </td>
</tr>