復制代碼 代碼如下:

    <script type="text/javascript">
var db = "0.123456789";//原數值
var num = 5;//小數點后位數
var re = new RegExp("/d+/./d{" + num + "}","gm");
alert(db.match(re));
</script></td>
   </tr>
 </table>