带有jQuery和CSS3的响应标题下拉菜单

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标题导航的响应下拉菜单，该菜单利用CSS3媒体查询来检测屏幕尺寸，并在达到最大屏幕宽度时将水平菜单项折叠为全屏滑动切换菜单。

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如何使用它：
1.从嵌套的导航列表创建多级标题导航，如下所示：

<header>
  <div class="logo">YOUR LOGO HERE</div>
  <nav>
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li class="sub-menu"><a href="#">Services</a>
        <ul>
          <li><a href="#">Link 1</a></li>
          <li><a href="#">Link 2</a></li>
          <li><a href="#">Link 3</a></li>
          <li><a href="#">Link 4</a></li>
        </ul>
      </li>
      <li><a href="#">Team</a></li>
      <li class="sub-menu"><a href="#"><a href="https://www.jqueryscript.net/tags.php?/Portfolio/">Portfolio</a></a>
        <ul>
          <li><a href="#">Link 1</a></li>
          <li><a href="#">Link 2</a></li>
          <li><a href="#">Link 3</a></li>
          <li><a href="#">Link 4</a></li>
        </ul>
      </li>
      <li><a href="#">Contact</a></li>
    </ul>
  </nav>
  <div class="menu-toggle">
    <a href="https://www.jqueryscript.net/menu/">Menu</a> Toggler Here
  </div>
</header>

2.常规下拉菜单的CSS样式。

/* Header */
header {
  position: absolute;
  top: 0;
  left: 0;
  padding: 0 100px;
  background: #262626;
  width: 100%;
  box-sizing: border-box;
}

/* LOGO */
header .logo {
  color: #FFF;
  height: 50px;
  line-height: 50px;
  font-size: 24px;
  float: left;
  font-weight: bold;
}

/* Dropdown Nav */
header nav {
  float: right;
}

/* UL */
header nav ul {
  margin: 0;
  padding: 0;
  display: flex;
}

/* Nav Items */
header nav ul li {
  list-style: none;
  position: relative;
}

/* Sub-menu */
header nav ul li.sub-menu:before {
  content: '\f0d7';
  font-family: fontAwesome;
  position: absolute;
  line-height: 50px;
  color: #FFF;
  right: 5px;
  cursor: pointer;
}

header nav ul li.active.sub-menu:before {
  content: '\f0d8';
}

header nav ul li ul {
  position: absolute;
  left: 0;
  background: #333;
  display: none;
}

header nav ul li.active ul {
  display: block;
}

header nav ul li ul li {
  display: block;
  width: 200px;
}

header nav ul li a {
  height: 50px;
  line-height: 50px;
  padding: 0 20px;
  color: #FFF;
  text-decoration: none;
  display: block;
}

header nav ul li a:hover, header nav ul li a.active {
  color: #FFF;
  background: #2196f3;
}

3.切换菜单的CSS样式。

/* Toggle Button */
.menu-toggle {
  color: #FFF;
  float: right;
  line-height: 50px;
  font-size: 24px;
  cursor: pointer;
  display: none;
}

/* Media Queries */
@media (max-width: 991px) {
  header {
    padding: 0 20px;
  }

  .menu-toggle {
    display: block;
  }

  header nav {
    position: absolute;
    width: 100%;
    height: calc(100vh - 50px);
    background: #333;
    top: 50px;
    left: -100%;
    transition: 0.5s;
  }

  header nav.active {
    left: 0;
  }

  header nav ul {
    display: block;
    text-align: center;
  }

  header nav ul li a {
    border-bottom: 1px solid rgba(0,0,0,.2);
  }

  header nav ul li.active ul {
    position: relative;
    background: #003e6f;
  }

  header nav ul li ul li {
    width: 100%;
  }
}

4.在小屏幕上运行时，用于启用切换按钮以打开/关闭菜单的核心JavaScript。

$(document).ready(function(){
  $('.menu-toggle').click(function(){
    $('nav').toggleClass('active');
  });

  $('ul li').click(function(){
    $(this).siblings().removeClass('active');
    $(this).toggleClass('active');
  })
})

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