在窗口加载时使用JS打印html表

<table id="myTable">
  <tr>
    <td>姓名</td>
    <td>年龄</td>
  </tr>
  <tr>
    <td>张三</td>
    <td>25</td>
  </tr>
  <tr>
    <td>李四</td>
    <td>30</td>
  </tr>
</table>

window.onload = function() {
  // 在这里编写打印表格的代码
};

window.onload = function() {
  var table = document.getElementById("myTable");
  var rows = table.getElementsByTagName("tr");

  for (var i = 0; i < rows.length; i++) {
    var cells = rows[i].getElementsByTagName("td");
    for (var j = 0; j < cells.length; j++) {
      console.log(cells[j].innerText);
    }
  }
};