调整窗口大小时不出现汉堡按钮

小编典典

调整窗口大小时不出现汉堡按钮

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我试图只创建一个简单的响应式汉堡包按钮，但是当我将窗口调整为更小的窗口时，汉堡包按钮不会出现。

当我打开控制台时，会出现此错误消息。我到处搜索，没有什么对我有用

Uncaught TypeError: Cannot read properties of null (reading 'addEventListener')

虽然它是基本的 HTML 和 CSS，但我不知道错误在哪里。

有什么错误？

const hamburger = document.querySelector(".hambuger");
const navMenu = document.querySelector(".nav-menu");

hamburger.addEventListener("click", () => {
  hamburger.classList.toggle("active");
  navMenu.classList.toggle("active");
});

document.querySelectorAll("nav-link").forEach((n) =>
  n.addEventListener("click", () => {
    hamburger.classList.remove("active");
    navMenu.classList.remove("active");
  })
);
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

header {
  background-color: #262626;
}

li {
  list-style: none;
}

a {
  color: white;
  text-decoration: none;
}

.navbar {
  min-height: 70px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
}
.nav-menu {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 60px;
}

.nav-branding {
  font-size: 2rem;
}

.nav-link {
  transition: 0.7s ease;
}

.nav-link:hover {
  color: dodgerblue;
}

.hamburger {
  display: none;
  cursor: pointer;
}

.bar {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px auto;
  -webkit-transition: all 0.3s ease-in-out;
  transition: all 0.3s ease-in-out;
  background-color: white;
}

@media (max-width: 768px) {
  .hanburger {
    display: block;
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    gap: 0;
    flex-direction: column;
    background-color: #262626;
    width: 100%;
    text-align: center;
    transition: 0.3s;
  }

  .nav-item {
    margin: 16px 0;
  }

  .nav-item.active {
    left: 0;
  }
}
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>document</title>
  </head>
  <body>
    <header>
      <nav class="navbar">
        <a href="#" class="nav-branding">DEV.</a>
        <ul class="nav-menu">
          <li class="nav-item">
            <a href="#" class="nav-link">Home</a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">About</a>
          </li>
          <li class="nav-item">
            <a href="#" class="nav-link">Contact</a>
          </li>
        </ul>
        <div class="hamburger">
          <span class="bar"></span>
          <span class="bar"></span>
          <span class="bar"></span>
        </div>
      </nav>
    </header>
    <script src="script.js"></script>
  </body>
</html>

阅读 104

2022-08-15

共1个答案

小编典典

const hamburger = document.querySelector(".hambuger");
const navMenu = document.querySelector(".nav-menu");

在这里，您可能打错了“.hamburger”。因此，汉堡类的事件监听器返回 null。

2022-08-15