tryjsref_colgroup_span2 在线代码实例

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运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
table,th,td{
    border:1px solid black;
}
</style>
</head>
<body>
<table>
    <colgroup id="myColgroup"></colgroup>
    <tr>
        <th>ISBN</th>
        <th>Title</th>
        <th>Price</th>
    </tr>
    <tr>
        <td>3476896</td>
        <td>My first HTML</td>
        <td>$53</td>
    </tr>
    <tr>
        <td>5869207</td>
        <td>My first CSS</td>
        <td>$49</td>
    </tr>
</table>
<p>点击按钮设置表格中前两列的颜色为红色</p>
<p id="demo"></p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
    document.getElementById("myColgroup").span="2";
 
 
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运行结果
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