案例：javascript案例     状态：可编辑再运行    进入横版
​x
document.getElementById("myCol").style.backgroundColor="red";
 
1
<!DOCTYPE html>
2
<html>
3
<head>
4
<style>
5
table,th,td
6
{
7
border:1px solid black;
8
}
9
</style>
10
</head>
11
<body>
12
​
13
<table>
14
  <colgroup>
15
    <col id="myCol">
16
    <col style="background-color:yellow">
17
  </colgroup>
18
  <tr>
19
    <th>ISBN</th>
20
    <th>Title</th>
21
    <th>Price</th>
22
  </tr>
23
  <tr>
24
    <td>3476896</td>

 运行结果　
　北美留学生论坛