HTML DOM Column用法及代码示例

HTML DOM中的Column Object用于表示HTML <col>元素。此标记用于设置或获取<col>元素的属性。可以使用getElementById()方法进行访问。

用法:

document.getElementById("Col_ID");

此Col_ID分配给HTML <col>元素。

属性值：

span:用于设置或返回跨度属性。

示例1：使用document.getElementById(“myCol”).id返回“col id”；

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        HTML | DOM Column Object 
    </title> 
</head> 
<style> 
    #myCol { 
        background:green; 
    } 
      
    table { 
        color:white; 
        margin-left:150px; 
    } 
      
    #Geek_p { 
        color:green; 
        font-size:30px; 
    } 
      
    td { 
        padding:10px; 
    } 
</style> 
  
<body style="text-align:center;"> 
  
    <h1 style="color:green;">   
            GeeksForGeeks   
        </h1> 
  
    <h2>HTML | DOM Column Object</h2> 
    <table> 
        <colgroup> 
            <col id="myCol" span="2"> 
                <col style="background-color:green"> 
        </colgroup> 
        <tr> 
            <th>S.No</th> 
            <th>Title</th> 
            <th>Geek_id</th> 
        </tr> 
        <tr> 
            <td>Geek_1</td> 
            <td>GeekForGeeks</td> 
            <th>Geek_id_1</th> 
        </tr> 
        <tr> 
            <td>Geek_2</td> 
            <td>GeeksForGeeks</td> 
            <th>Geek_id_2</th> 
        </tr> 
    </table> 
    <br> 
    <button onclick="myGeeks()"> 
        Click 
    </button> 
    <h4> 
            <p id="Geek_p" style="color:green"></p> 
        </h4> 
    <script> 
        function myGeeks() { 
            // access col element 
            var x = document.getElementById( 
                "myCol").id; 
            document.getElementById( 
                "Geek_p").innerHTML = x; 
        } 
    </script> 
</body> 
  
</html>

输出

在单击按钮之前：
单击按钮后：

示例-2：使用document.getElementById(“myCol”).span从“col id”返回span元素的数目；

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        HTML | DOM Column Object 
    </title> 
</head> 
<style> 
    #myCol { 
        background:green; 
    } 
      
    table { 
        color:white; 
        margin-left:150px; 
    } 
      
    #Geek_p { 
        color:green; 
        font-size:30px; 
    } 
      
    td { 
        padding:10px; 
    } 
</style> 
  
<body style="text-align:center;"> 
  
    <h1 style="color:green;">  
            GeeksForGeeks  
        </h1> 
  
    <h2>HTML | DOM Column Object</h2> 
    <table> 
        <colgroup> 
            <col id="myCol" span="2"> 
                <col style="background-color:green"> 
        </colgroup> 
        <tr> 
            <th>S.No</th> 
            <th>Title</th> 
            <th>Geek_id</th> 
        </tr> 
        <tr> 
            <td>Geek_1</td> 
            <td>GeekForGeeks</td> 
            <th>Geek_id_1</th> 
        </tr> 
        <tr> 
            <td>Geek_2</td> 
            <td>GeeksForGeeks</td> 
            <th>Geek_id_2</th> 
        </tr> 
    </table> 
    <br> 
    <button onclick="myGeeks()"> 
        Click 
    </button> 
    <h4> 
            <p id="Geek_p" style="color:green"></p> 
        </h4> 
    <script> 
        function myGeeks() { 
            // access col element 
            var x = document.getElementById( 
                "myCol").span; 
            document.getElementById( 
                "Geek_p").innerHTML = x; 
        } 
    </script> 
</body> 
  
</html>

输出

在单击按钮之前：
单击按钮后：

支持的浏览器：

谷歌浏览器
火狐浏览器
Edge
Safari
Opera

相关用法

注：本文由纯净天空筛选整理自PranchalKatiyar大神的英文原创作品 HTML | DOM Column Object。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。