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javascript - 如何使用JQuery第一选择器进行特定选择

转载 作者：行者123 更新时间：2023-11-28 17:13:39 26 4
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我正在学习 JQuery，并对第一个选择器有疑问。我想选择第一个 li 元素，它是一个类的子元素。当我只使用 li:first 时，一切都很好，但我无法在另一个类下使用它。

有什么建议吗？

这是代码。

JS

var navList;

navList = $('.nav-list').children();// select
console.log(navList);

var first = $('li:first');//Working but selection is not specific
//var first = $('.nav-list.li:first');//returning empty array??
//var first = $('.nav-list.children(li.filter(":first"))');//??? blocking the rest??
//var first = $('.nav-list.children().li.filter(":first")');//???
//var first = $('.nav-list.children().li:first');//???

console.log(first);
console.log("ended");

HTML

<!DOCTYPE html>
<!--

This is the HTML document that you'll use jQuery to modify. To take the quiz, click over to app.js!

-->
<html lang="en">
<head>
    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <meta charset="UTF-8">
</head>
<body>
    <div class="container">
        <header class="header">
            <nav id="nav" class="navigator">
                <h1>Nav Header</h1>
                <ul class="nav-list">
                    <li class="nav-item"><a>Item #1</a></li>
                    <li class="nav-item active"><a href="#2">Item #2</a></li>
                    <li class="nav-item"><a href="#3">Item #3</a></li>
                    <li class="nav-item"><a href="#4">Item #4</a></li>
                    <li class="nav-item"><a href="#5">Item #5</a></li>
                    <li class="nav-item"><a href="#6">Item #6</a></li>
                </ul>
            </nav>
        </header>
        <div class="articles">
            <input id="input" value="Cool Articles" type="text">
            <h1>Cool Articles</h1>
            <ul class="article-list">
                <li class="article-item">
                    <header>Article #1</header>
                    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Expedita sapiente officiis beatae, ut consequuntur. Quos minus neque eius, nemo sunt excepturi eveniet amet veritatis voluptatibus corporis ea, blanditiis porro ad!</p>
                    <h3>Sample Image Title here</h3>
                    <img src="http://placehold.it/350x150" alt="Placeholder Image">
                    <ul>
                        <li class="bold">James</li>
                        <li>Lily</li>
                        <li>Harry</li>
                    </ul>
                    <p>Magnam ex autem doloremque, tempore mollitia atque aut delectus corporis rem similique voluptates omnis reiciendis vitae impedit exercitationem unde quaerat, doloribus voluptatibus molestias et veritatis sed optio repudiandae? Provident, voluptates.</p>
                </li>
                <li class="article-item featured">
                    <header>Article #2</header>
                    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nihil animi ipsum, incidunt mollitia modi cum, eum ex doloremque rerum quod, maiores quisquam, enim quam unde cumque! Quam, doloremque. Voluptatum, maxime!</p>
                    <p>Numquam et quae, quasi. Reiciendis nemo mollitia eveniet alias, debitis facere atque excepturi et beatae laudantium commodi optio unde amet vitae libero quas cupiditate, nam porro minus. Quisquam, odit non.</p>
                </li>
                <li class="article-item">
                    <header>Article #3</header>
                    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Deserunt ratione, cum doloremque molestias labore amet at dicta reiciendis repudiandae fuga atque adipisci pariatur distinctio suscipit perferendis provident, facere ad aut.</p>
                    <p>Temporibus sapiente odio eveniet enim perferendis maxime, ratione, accusantium suscipit alias, soluta architecto culpa pariatur. Cupiditate nam eaque dolore voluptatem necessitatibus corporis iusto adipisci, dignissimos error, vitae quam, aliquid eius!</p>
                </li>
                <li class="article-item">
                    <header>Article #4</header>
                    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Voluptate commodi, est soluta eos voluptates eum! Modi sit quia ipsum fugiat nesciunt, assumenda deleniti consequuntur molestias reprehenderit. Voluptate corporis illum nam?</p>
                    <p>Quia, omnis. Quasi necessitatibus, ducimus, deserunt ipsa, reprehenderit sit a dolore fuga placeat magni culpa ipsam quas id aut veniam rerum pariatur enim harum recusandae quo odio consequuntur. Maxime, aperiam.</p>
                </li>
            </ul>
        </div>
    </div>
</body>
</html>

注意:HTML 代码已从 Udacity JQuery 类(class)复制。

最佳答案

您应该将选择器与 Descendant Selector 结合起来

var first = $('.nav-list li:first');

这意味着您在 .nav-list 内查找 li:first。

有关 jQuery 选择器的更多信息 here

关于javascript - 如何使用JQuery第一选择器进行特定选择，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53933919/

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