用js 添加tr

<table id="myTable">
  <tr>
    <th>姓名</th>
    <th>年龄</th>
  </tr>
</table>

// 获取表格元素
var table = document.getElementById("myTable");

// 创建新的行数据
var newRowData = "<tr><td>张三</td><td>25</td></tr>";

// 添加新行到表格
table.innerHTML += newRowData;

// 获取表格元素
var table = document.getElementById("myTable");

// 创建新的行
var newRow = table.insertRow();

// 创建并添加单元格
var cell1 = newRow.insertCell(0);
var cell2 = newRow.insertCell(1);

// 设置单元格内容
cell1.innerHTML = "李四";
cell2.innerHTML = "30";

var table = document.getElementById("myTable");
var fragment = document.createDocumentFragment();

for (var i = 0; i < 10; i++) {
  var newRow = table.insertRow();
  var cell1 = newRow.insertCell(0);
  var cell2 = newRow.insertCell(1);
  cell1.innerHTML = "姓名" + i;
  cell2.innerHTML = "年龄" + i;
  fragment.appendChild(newRow);
}

table.appendChild(fragment);