如何添加一个添加行按钮反应？

<button id="addRowBtn">添加行</button>

<table id="myTable">
  <tr>
    <th>姓名</th>
    <th>年龄</th>
  </tr>
  <tr>
    <td>张三</td>
    <td>20</td>
  </tr>
  <tr>
    <td>李四</td>
    <td>25</td>
  </tr>
</table>

<button id="addRowBtn">添加行</button>

<script>
  // 获取按钮元素
  var addRowBtn = document.getElementById('addRowBtn');

  // 添加事件监听器
  addRowBtn.addEventListener('click', function() {
    // 定义事件处理函数
    var table = document.getElementById('myTable');
    var newRow = document.createElement('tr');
    var nameCell = document.createElement('td');
    var ageCell = document.createElement('td');
    nameCell.textContent = '新行';
    ageCell.textContent = '新行';
    newRow.appendChild(nameCell);
    newRow.appendChild(ageCell);
    table.appendChild(newRow);
  });
</script>