页面展示的表格第一列自动编号，如图
代码如下：
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>自动编号</title>
6 </head>
7
8 <script language="javascript" type="text/javascript">
9 window.onload = function () {
10 var tableLine = document.getElementById("number");
11 for (var i = 0; i < tableLine.rows.length; i++) {
12 tableLine.rows[i].cells[0].innerHTML = (i + 1);
13 }
14 }
15 </script>
16 <body>
17
18 <table>
19 <tr>
20 <td>编号</td>
21 <td>内容</td>
22 </tr>
23 <tbody id="number">
24 <tr>
25 <td></td>
26 <td>一</td>
27 </tr>
28
29 <tr>
30 <td></td>
31 <td>二</td>
32 </tr>
33
34 <tr>
35 <td></td>
36 <td>三</td>
37 </tr>
38 </tbody>
39 </table>
40
41 </body>
42 </html>
