在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.com)</title>
<style>table, td {
    border: 1px solid black;
}
</style>
</head>
<body>

<p>点击按钮弹出第一行第一个单元格的内容：</p>

<table id="myTable">
  <tr>
    <td>Row1 cell1</td>
    <td>Row1 cell2</td>
  </tr>
  <tr>
    <td>Row2 cell1</td>
    <td>Row2 cell2</td>
  </tr>
  <tr>
    <td>Row3 cell1</td>
    <td>Row3 cell2</td>
  </tr>
</table>
<br>

<button onclick="myFunction()">点我</button>

<script>
function myFunction() {
    alert(document.getElementById("myTable").rows[0].cells[0].innerHTML);
}
</script>

</body>
</html>
源代码

动行结果
