我的代码无法工作，我不知道为什么？

谁来帮帮我。

无法将类名添加到活动导航栏

<nav class="navbar">
    <ul>
        <li class="nav-list"><a href="home.html" class="navlink">Home</a></li>
        <li class="nav-list"><a href="aboutme.html" class="navlink">About me</a></li>
        <li class="nav-list"><a href="work.html" class="navlink">Work</a></li>
        <li class="nav-list"><a href="contact.html" class="navlink">Contact me</a></li>
    </ul>
</nav>

CSS

<nav class="navbar">
    <ul>
        <li class="nav-list"><a href="home.html" class="navlink">Home</a></li>
        <li class="nav-list"><a href="aboutme.html" class="navlink">About me</a></li>
        <li class="nav-list"><a href="work.html" class="navlink">Work</a></li>
        <li class="nav-list"><a href="contact.html" class="navlink">Contact me</a></li>
    </ul>
</nav>

JavaScript

<nav class="navbar">
    <ul>
        <li class="nav-list"><a href="home.html" class="navlink">Home</a></li>
        <li class="nav-list"><a href="aboutme.html" class="navlink">About me</a></li>
        <li class="nav-list"><a href="work.html" class="navlink">Work</a></li>
        <li class="nav-list"><a href="contact.html" class="navlink">Contact me</a></li>
    </ul>
</nav>

顺晟科技：

1)您必须将类选择器用作:

<nav class="navbar">
    <ul>
        <li class="nav-list"><a href="home.html" class="navlink">Home</a></li>
        <li class="nav-list"><a href="aboutme.html" class="navlink">About me</a></li>
        <li class="nav-list"><a href="work.html" class="navlink">Work</a></li>
        <li class="nav-list"><a href="contact.html" class="navlink">Contact me</a></li>
    </ul>
</nav>

2)必须使用method添加新类:

<nav class="navbar">
    <ul>
        <li class="nav-list"><a href="home.html" class="navlink">Home</a></li>
        <li class="nav-list"><a href="aboutme.html" class="navlink">About me</a></li>
        <li class="nav-list"><a href="work.html" class="navlink">Work</a></li>
        <li class="nav-list"><a href="contact.html" class="navlink">Contact me</a></li>
    </ul>
</nav>

JS

<nav class="navbar">
    <ul>
        <li class="nav-list"><a href="home.html" class="navlink">Home</a></li>
        <li class="nav-list"><a href="aboutme.html" class="navlink">About me</a></li>
        <li class="nav-list"><a href="work.html" class="navlink">Work</a></li>
        <li class="nav-list"><a href="contact.html" class="navlink">Contact me</a></li>
    </ul>
</nav>

还有，当前代码中有一个错误：而不是