javascript - 我无法将类(class)添加到第 n 个 child

Question

HTML:

        <div id="brojac-poteza" style="clear:both;padding-top:40px;padding-left:60px;padding-right:40px">
            <div class="round-end darker-back card-choice">1</div>
            <div class="darker-back card-choice">2</div>
            <div class="darker-back card-choice">3</div>
            <div class="darker-back card-choice">4</div>
            <div class="darker-back card-choice">6</div>
            <div class="darker-back card-choice">5</div>
            <div class="darker-back card-choice">7</div>
            <div class="darker-back card-choice">8</div>
            <div class="darker-back card-choice">9</div>
            <div class="darker-back card-choice">10</div>
        </div>

script.js(在这段代码之上我设置了var g = 1;)

g += 1;

$('#brojac-poteza:nth-child(g)').addClass('round-end');

当我测试时它说 Uncaught Error: Syntax error, unrecognized expression: :nth-child

Answer 1

改成

$('#brojac-poteza:eq('+g+')').addClass('round-end');