console 命令行工具 X clear

console

function aboveFrames()
  {
  document.getElementById('myTable').frame="above"
  }
function belowFrames()
  {
  document.getElementById('myTable').frame="below"
  }

<table id="myTable"> 
  <tbody>
   <tr> 
    <td>100</td> 
    <td>200</td> 
   </tr> 
   <tr> 
    <td>300</td> 
    <td>400</td> 
   </tr> 
  </tbody>
 </table> 
 <br> 
 <input type="button" onclick="aboveFrames()" value="显示上边框"> 
 <input type="button" onclick="belowFrames()" value="显示下边框">