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The selector for selecting child elements in jquery is the nth-child selector

黄舟Original: 2017-06-23 14:16:192451browse

jQuery The nth-child selector is used to select the nth child tag of its parent tag. Its index starts from 1, that is, n starts from 1, not from 0.

For example:

1 $(‘tr:nth-child(3)’) —Select the third tr child element in the tr parent tag element.

2 $(‘tr:nth-child(3n)’)—Select the tr child tag element at the 3rd multiple position in the tr parent tag.

3 $(‘tr:nth-child(even)’)—Selects all even-numbered tr child elements in the tr parent tag.

jquery Example

A simple example is used to illustrate nth-childFunctionDynamicly change the background color of the table row.

<html>  
    <head>  
        <title>jquery nth-child example</title>  
        <script type="text/javascript" src="../jquery-1.11.1.min.js"></script>  
    </head>  
    <body>  
        <h1>jquery nth-child example</h1>  
        <table boder=1>  
            <tr><td>row 1</td></tr>  
            <tr><td>row 2</td></tr>  
            <tr><td>row 3</td></tr>  
            <tr><td>row 4</td></tr>  
            <tr><td>Row #5</td></tr>  
    <tr><td>Row #6</td></tr>  
    <tr><td>Row #7</td></tr>  
    <tr><td>Row #8</td></tr>  
    <tr><td>Row #9</td></tr>  
    <tr><td>Row #10</td></tr>  
        </table>  
        <br/>  
        <button>:nth-child(4)</button>  
            <button>:nth-child(3n)</button>  
                <button>:nth-child(even)</button>

     <button>:nth-child(odd)</button>  
                <script type="text/javascript">  
                    $("button").click(function(){  
                        var str=$(this).text();  
                        $("tr").css("background","white");  
                        $("tr"+str).css("background","coral");  
                          
                          
                        });  
                      
                      
                    </script>  
</body>  
lt;/html>

Effect: