html - 下拉菜单只显示 2 行而不是 3 行

Question

我的导航栏只显示 2 个子菜单标题。这是为什么？

body {
  margin: 0;
  padding: 0;
}

.nav ul {
  list-style: none;
  background-color: #36527c;
  text-align: center;
  padding: 0;
  margin: 0;
  height: 121px;
  position: relative;
  z-index: 99999;
}

.nav li {
  font-family: Open sans hebrew;
  font-size: 1.2em;
  line-height: 40px;
  margin-top: 35px;
  position: relative;
  z-index: 99999;
  display: none;
}

.nav a {
  text-decoration: none;
  color: #fff;
  display: block;
  padding-left: 15px;
  border-bottom: 1px solid #888;
  transition: .3s background-color;
  position: relative;
  z-index: 99999;
}

.nav a:hover {
  background-color: #aaa;
  color: #444;
  cursor: default;
  position: relative;
  z-index: 99999;
}

.nav a.active {
  position: relative;
  z-index: 99999;
}


/* Sub Menus */

.nav li li {
  position: absolute;
  z-index: 999;
  font-size: .8em;
}

<div class="nav">
  <ul>
    <li class="home"><a href="#">Home</a></li>
    <li class="tutorials"><a href="#">Tutorials</a>
      <ul>
        <li><a href="#">Tutorial #1@@</a></li>
        <li><a href="#">Tutorial #2</a></li>
        <li><a href="#">Tutorial #3</a></li>
      </ul>
    </li>
    <li class="about"><a class="active" href="#">About</a></li>
    <li class="news"><a href="#">Newsletter</a>
      <ul>
        <li><a href="#">News #1</a></li>
        <li><a href="#">News #2@@@</a></li>
        <li><a href="#">News #3</a></li>
      </ul>
    </li>
    <li class="contact"><a href="#">Contact</a></li>
  </ul>
</div>

Answer 1

您的 .nav UL CSS 的高度设置为 121px，不幸的是，这不仅会影响第一个 UL，还会影响所有这些。给它一个可以绑定(bind)到你的高度的类或 ID 可以解决这个问题。

body {
  margin: 0;
  padding: 0;
}

.nav ul {
  list-style: none;
  background-color: #36527c;
  text-align: center;
  padding: 0;
  margin: 0;
  position: relative;
  z-index: 99999;
}

.mainul {
  height: 121px;
}

.nav li {
  font-family: Open sans hebrew;
  font-size: 1.2em;
  line-height: 40px;
  margin-top: 35px;
  position: relative;
  z-index: 99999;
  display: none;
}

.nav a {
  text-decoration: none;
  color: #fff;
  display: block;
  padding-left: 15px;
  border-bottom: 1px solid #888;
  transition: .3s background-color;
  position: relative;
  z-index: 99999;
}

.nav a:hover {
  background-color: #aaa;
  color: #444;
  cursor: default;
  position: relative;
  z-index: 99999;
}

.nav a.active {
  position: relative;
  z-index: 99999;
}


/* Sub Menus */

.nav li li {
  position: absolute;
  z-index: 999;
  font-size: .8em;
}

<div class="nav">
  <ul class="mainul">
    <li class="home"><a href="#">Home</a></li>
    <li class="tutorials"><a href="#">Tutorials</a>
      <ul>
        <li><a href="#">Tutorial #1@@</a></li>
        <li><a href="#">Tutorial #2</a></li>
        <li><a href="#">Tutorial #3</a></li>
      </ul>
    </li>
    <li class="about"><a class="active" href="#">About</a></li>
    <li class="news"><a href="#">Newsletter</a>
      <ul>
        <li><a href="#">News #1</a></li>
        <li><a href="#">News #2@@@</a></li>
        <li><a href="#">News #3</a></li>
      </ul>
    </li>
    <li class="contact"><a href="#">Contact</a></li>
  </ul>
</div>