弹出插入 <thead> 的 HTML 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 displayResult() {
      alert(document.getElementById('myTable').tHead.innerHTML);
    }
  </script>
</head>
<body>

  <table id="myTable" border="1">
    <thead>
      <tr>
        <th>Month</th>
        <th>Savings</th>
      </tr>
    </thead>
    <tfoot>
      <tr>
        <td>Sum</td>
        <td>$180</td>
      </tr>
    </tfoot>
    <tbody>
      <tr>
        <td>January</td>
        <td>$100</td>
      </tr>
      <tr>
        <td>February</td>
        <td>$80</td>
      </tr>
    </tbody>
  </table>
  <br>
  <button type="button" onclick="displayResult()">显示头部html文本</button>

</body>
</html>
        