<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.js"></script>
<title>test</title>
<style>
</style>
</head>
<body>
<table class="my_table">
<thead class="my_thead">
<tr>
<th>编号</th>
<th>姓名</th>
<th>年龄</th>
</tr>
</thead>
<tbody class="my_tbody" id="tb1">
<tr id="1">
<td>001</td>
<td>张三</td>
<td>20</td>
</tr>
<tr>
<td>002</td>
<td>张三</td>
<td>20</td>
</tr>
<tr>
<td>003</td>
<td>张三</td>
<td>20</td>
</tr>
</tbody>
</table>
<button id="btn">添加</button>
<script>
// 删除id==1的这一行：用remove()方法
$("#1").remove();
// 当点击 “添加” 按钮时，给id==tb1的tbody添加一行："<tr><td>004</td><td>张三</td><td>20</td></tr>"
$("#btn").click(function(){
$("#tb1").append("<tr><td>004</td><td>张三</td><td>20</td></tr>");
});
</script>
</body>
</html>
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