​x
 
<!DOCTYPE html>
<html>
<head>
<style>
table, td {
  border: 1px solid black;
}
</style>
</head>
<body>
​
<p>单击该按钮可在表格行的末尾插入新单元格。</p>
​
<table>
  <tr id="myRow">
    <td>第一单元格</td>
    <td>第二单元格</td>
    <td>第三单元格</td>
  </tr>
</table><br>
​
<button onclick="myFunction()">试一试</button>
​
<script>
function myFunction() {
  var row = document.getElementById("myRow");
  var x = row.insertCell(-1);
  x.innerHTML = "新的单元格";
}
</script>
​
</body>
</html>
​