jQuery :nth-last-child()用法及代码示例

：nth-last-child()选择器用于选择所有属于n的元素。^th他们父母的最后一个孩子。元素的计数从最后一个元素开始。

用法:

:nth-last-child(n|even|odd|formula)

参数：：nth-last-child()选择器包含以下列出的参数：

n:它保存所选元素的子索引号。计数从结束开始。第一个孩子的索引号是1。
even:它选择所有偶数子元素。
odd:它选择所有奇数子元素。
formula:用于指定用于选择子元素的公式。该公式可以采用(an + b)的形式。

以下示例说明了jQuery中的nth-last-child()选择器：

范例1：本示例将其父母的倒数第二个标题(div标签)的背景颜色更改为绿色，并将text-color更改为白色。

<!DOCTYPE html>   
<html>   
    <head>  
        <title>  
            jQuery |:nth-last-child() Selector 
        </title> 
          
        <script src= 
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"> 
        </script> 
          
        <!-- Script to use nth-last-child selector -->
        <script> 
            $(document).ready(function() { 
                $("h4:nth-last-child(2)").css({ 
                    "background-color":"green",  
                    "color":"white" 
                }); 
            }); 
        </script> 
          
        <style> 
            option { 
                font-weight:bold; 
                font-size:25px; 
                color:green; 
            } 
            select { 
                font-weight:bold; 
                font-size:25px; 
                color:green; 
            } 
        </style> 
    </head> 
      
    <body style="text-align:center;">   
        <h1>   
            jQuery |:nth-last-child() Selector 
        </h1>  
          
        <div style= "border:1px solid blue;"> 
            <h4>The first heading in first div.</h4> 
            <h4>The second last heading in first div.</h4> 
            <h4>The last heading in first div.</h4> 
        </div><br> 
          
        <div style= "border:1px solid blue;"> 
            <h4>The first heading in second div.</h4> 
            <h4>The second last heading in first div.</h4> 
            <h4>The last heading in second div.</h4> 
        </div>            
    </body>   
</html>

输出：

范例2：本示例将<body>标签的倒数第二个标题的背景颜色更改为绿色，并将text-color更改为白色。

<!DOCTYPE html>   
<html>   
    <head>  
        <title>  
            jQuery |:nth-last-child() Selector 
        </title> 
          
        <script src= 
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"> 
        </script> 
          
        <!-- Script to use nth-last-child selector to  
                select nth last odd elements -->
        <script> 
            $(document).ready(function() { 
                $("h4:nth-last-child(odd)").css({ 
                    "background-color":"green",  
                    "color":"white" 
                }); 
            }); 
        </script> 
          
        <style> 
            option { 
                font-weight:bold; 
                font-size:25px; 
                color:green; 
            } 
            select { 
                font-weight:bold; 
                font-size:25px; 
                color:green; 
            } 
        </style> 
    </head>  
      
    <body style="text-align:center;">   
        <h1>   
            jQuery |:nth-last-child() Selector 
        </h1>  
          
        <div> 
            <h4>The first heading in body.</h4> 
            <h4>The second last heading in body.</h4> 
            <h4>The Third heading in body.</h4> 
            <h4>The Fourth heading in body.</h4> 
        </div> 
    </body>   
</html>

输出：

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 jQuery | :nth-last-child() Selector。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。