创建和删除 thead 元素 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function createTHead() {
      var x = document.getElementById("myTable");
      if (!x.tHead) {
        var header = x.createTHead();
        var row = header.insertRow(0);
        var cell = row.insertCell(0);
        cell.innerHTML = "<b>这是个表头</b>";
      }
    }

    function deleteTHead() {
      document.getElementById("myTable").deleteTHead();
    }
  </script>
</head>
<body>

  <table id="myTable" border="1">
    <tr>
      <td>cell 1</td>
      <td>cell 2</td>
    </tr>
    <tr>
      <td>cell 3</td>
      <td>cell 4</td>
    </tr>
  </table>
  <br>
  <button type="button" onclick="createTHead()">创建表头</button>
  <button type="button" onclick="deleteTHead()">删除表头</button>

</body>
</html>
        