js 获取表格内容

<table id="myTable">
  <tr>
    <th>Header 1</th>
    <th>Header 2</th>
  </tr>
  <tr>
    <td>Row 1, Cell 1</td>
    <td>Row 1, Cell 2</td>
  </tr>
  <tr>
    <td>Row 2, Cell 1</td>
    <td>Row 2, Cell 2</td>
  </tr>
</table>

var table = document.getElementById("myTable");
var rows = table.getElementsByTagName("tr");
for (var i = 0; i < rows.length; i++) {
  console.log(rows[i].innerHTML);
}

var table = document.getElementById("myTable");
var cells = table.getElementsByTagName("td");
for (var i = 0; i < cells.length; i++) {
  console.log(cells[i].innerHTML);
}

var table = document.getElementById("myTable");
var headers = table.getElementsByTagName("th");
for (var i = 0; i < headers.length; i++) {
  console.log(headers[i].innerHTML);
}