:nth-last-of-type() Selector


nth-last-of-type selector

描述: 选择的所有他们的父级元素的第n个子元素,计数从最后一个元素到第一个。

  • 添加的版本: 1.9jQuery( ":nth-last-of-type(index/even/odd/equation)" )

    index: 每个相匹配子元素的索引值,从最后一个开始(1),也可以是字符串 even 或 odd,或一个方程式( 例如 :nth-last-of-type(even), :nth-last-of-type(4n))

因为jQuery的实现:nth-是严格来自CSS规范,n值是“1-indexed”,也就是说,从1开始计数。 对于所有其他选择器表达式比如:eq():even ,jQuery遵循JavaScript的“0索引”的计数。因此,给定一个单一<ul>包含3个<li>$('li:nth-last-of-type(1)')选择第3个,也就是最后一个<li>

这个不寻常的用法,可进一步讨论中找到 W3C CSS specification.

例子:

Example: 在每个匹配的ul中查找倒数第二个li,并将它标记出来。

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<!DOCTYPE html>
<html>
<head>
<style>
div { float:left; }
span { color:blue; }
</style>
<script src="https://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div>
<ul>
<li>John</li>
<li>Karl</li>
<li>Adam</li>
</ul>
</div>
<div>
<ul>
<li>Dan</li>
</ul>
</div>
<div>
<ul>
<li>Dave</li>
<li>Rick</li>
<li>Timmy</li>
<li>Gibson</li>
</ul>
</div>
<script>$("ul li:nth-last-of-type(2)").append("<span> - 2nd to last!</span>");</script>
</body>
</html>

Demo:

Example: This is a playground to see how the selector works with different strings.

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<!DOCTYPE html>
<html>
<head>
<style>
button { display:block; font-size:12px; width:100px; }
div { float:left; margin:10px; font-size:10px;
border:1px solid black; }
span { color:blue; font-size:18px; }
#inner { color:red; }
td { width:50px; text-align:center; }
</style>
<script src="https://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div>
<button>:nth-last-of-type(even)</button>
<button>:nth-last-of-type(odd)</button>
<button>:nth-last-of-type(3n)</button>
<button>:nth-last-of-type(2)</button>
</div>
<div>
<button>:nth-last-of-type(3n+1)</button>
<button>:nth-last-of-type(3n+2)</button>
</div>
<div>
<table>
<tr><td>John</td></tr>
<tr><td>Karl</td></tr>
<tr><td>Brandon</td></tr>
<tr><td>Benjamin</td></tr>
</table>
</div>
<div>
<table>
<tr><td>Sam</td></tr>
</table>
</div>
<div>
<table>
<tr><td>Glen</td></tr>
<tr><td>Tane</td></tr>
<tr><td>Ralph</td></tr>
<tr><td>David</td></tr>
<tr><td>Mike</td></tr>
<tr><td>Dan</td></tr>
</table>
</div>
<span>tr<span id="inner"></span></span>
<script>
$("button").click(function () {
var str = $(this).text();
$("tr").css("background", "white");
$("tr" + str).css("background", "#ff0000");
$("#inner").text(str);
});
</script>
</body>
</html>

Demo: