console 命令行工具 X clear

console

function createCaption()
  {
  var x=document.getElementById('myTable').createCaption()
  x.innerHTML="我的表格标题"
  }

<table id="myTable" border="1"> 
  <tbody>
   <tr> 
    <td>Row1 cell1</td> 
    <td>Row1 cell2</td> 
   </tr> 
   <tr> 
    <td>Row2 cell1</td> 
    <td>Row2 cell2</td> 
   </tr> 
  </tbody>
 </table> 
 <br> 
 <input type="button" onclick="createCaption()" value="创建标题">