table表格 td设置固定宽度

<table width="100%" border="1" cellpadding="0" cellspacing="0" style="table-layout:fixed">
  <tr>
    <td width="50">10</td>
    <td width="50">20</td>
    <td width="50">30</td>
    <td width="50">40</td>
    <td width="100">50</td>
    <td> </td>
  </tr>
  <tr>
    <td>宽度50</td>
    <td>宽度多多余</td>
    <td>宽度多余100想要换行</td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td> </td>
    <td> </td>
    <td> </td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
</table>