获取jQuery对象的第一个子元素

    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
    </ul>

<script>
        console.log($(‘ul li:first‘));
        console.log($("ul>li:first"));

        console.log($(‘ul‘).children(‘li‘).get(0));
        console.log($(‘ul‘).children(‘li‘).eq(0));
        console.log($(‘ul‘).children(‘li‘).first());

        console.log($(‘ul‘).find(‘li‘).get(0));
        console.log($(‘ul‘).find(‘li‘).eq(0));
        console.log($(‘ul‘).find(‘li‘).first());

        console.log($(‘ul‘).children(‘:first‘));
        console.log($(‘ul‘).children(‘li:first‘));
        console.log($(‘ul‘).children(‘li:first-child‘));
        console.log($(‘ul‘).children(‘li:nth-child(1)‘));

        console.log($(‘ul‘).find(‘:first‘));
        console.log($(‘ul‘).find(‘li:first‘));
        console.log($(‘ul‘).find(‘li:first-child‘));
        console.log($(‘ul‘).find(‘li:nth-child(1)‘));
    </script>

注意：.get()得到DOM对象，而.eq()、.first()、.children()、.find()等得到jQuery对象

原文链接：https://blog.csdn.net/PrisonersDilemma/article/details/90259555

原文地址：https://www.cnblogs.com/firstcsharp/p/12148710.html