javascript - 像图片中那样在css中制作下拉菜单

Question

我对如何重现以下内容有疑问:

我有这样的菜单:

body {
  background: white;
  margin: 0;
  padding: 0;
}
/*
/ nav
*/

nav {
  width: 100%;
  background: #000;
  border-bottom: 5px solid white;
  position: relative;
  font-family: 'Decker';
}
nav:after {
  content: '';
  height: 8px;
  width: 100%;
  background: inherit;
  position: absolute;
  bottom: -15px;
  left: 0px;
  z-index: 1;
}
nav ul {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  max-width: 100%;
  margin: auto;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  padding-bottom: .6em;
}
nav li {
  display: inline-block;
  list-style: none;
  position: relative;
  padding: 0 .5em;
}
nav li:last-child a:before {
  display: none;
}
nav li a {
  color: #fff;
  display: inline-block;
  padding: 1.6em 0.6em 0.7em 0.6em;
  text-decoration: none;
  position: relative;
  font-size: 18px;
  line-height: 1;
}
nav li a:before {
  content: "|";
  display: block;
  position: absolute;
  right: -10px;
  top: 1.6em;
  -webkit-transform: translateY(-4%);
  transform: translateY(-4%);
  line-height: inherit;
  font-size: inherit;
  color: #fff;
}
nav li a:after {
  display: none;
  content: "";
  position: absolute;
  bottom: -25px;
  left: 0px;
  width: 100%;
  height: 8px;
  background: #fac312;
  z-index: 2;
}
nav li a:hover {
  background: #b42024;
  color: #fff;
  text-decoration: none;
}
nav li a.active {
  background: #b42024;
  color: #fff;
  text-decoration: none;
}
nav li a.active:after {
  display: block;
  content: "";
  position: absolute;
  bottom: -25px;
  left: 0px;
  width: 100%;
  height: 8px;
  background: #fac312;
  z-index: 2;
}
nav li a:hover:after {
  display: block;
}

<nav>
  <ul>
    <li>
      <a href="" class="active">Home</a>
    </li>
    <li>
      <a href="">About Us</a>
    </li>
    <li>
      <a href="">Products</a>
    </li>
    <li>
      <a href="">Contact</a>
    </li>
  </ul>
</nav>

但是，我不知道如何制作如上图所示的下拉列表。

我希望有人能帮助我。提前致谢!

Answer 1

嘿，这就是你想要的 :) 我希望

body {
  background: white;
  margin: 0;
  padding: 0;
}

nav {
  width: 100%;
  background: #000;
  border-bottom: 5px solid white;
  position: relative;
}
nav:after {
  content: '';
  height: 8px;
  width: 100%;
  background: inherit;
  position: absolute;
  bottom: -15px;
  left: 0px;
  z-index: 1;
}
nav ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}
nav a {
  color: #fff;
  text-decoration: none;
}

.nav__cat {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  max-width: 100%;
  margin: auto;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  padding-bottom: .6em;
}

.nav__li {
  display: inline-block;
  list-style: none;
  position: relative;
  padding: 0 .5em;
}
.nav__li:last-child a:before {
  display: none;
}
.nav__li:hover > a {
  background: red;
}
.nav__li:hover > a:after {
  display: block;
}
.nav__li:hover .sub__category {
  visibility: visible;
  opacity: 1;
}

.nav__li > a {
  display: inline-block;
  padding: 25.6px 0.6em 0.7em 0.6em;
  position: relative;
  font-size: 18px;
  line-height: 1;
}
.nav__li > a:before {
  content: "|";
  display: block;
  position: absolute;
  right: -10px;
  top: 25.6px;
  -webkit-transform: translateY(-4%);
          transform: translateY(-4%);
  line-height: inherit;
  font-size: inherit;
}
.nav__li > a:after {
  display: none;
  content: "";
  position: absolute;
  bottom: -25px;
  left: 0px;
  width: 100%;
  height: 8px;
  background: #ffaf1a;
  z-index: 2;
}

.sub__category {
  visibility: hidden;
  opacity: 0;
}

.sub__category {
  position: absolute;
  top: 100%;
  left: 0px;
  min-width: 160px;
  width: 100%;
  z-index: 3;
  margin: 0 .5em;
  padding-top: 25.6px;
  -webkit-transition: all .12s linear;
  transition: all .12s linear;
}

.sub__li {
  text-align: center;
  border-bottom: 2px #000 solid;
  background: red;
}

.sub__link {
  padding: .7em 1em;
  display: block;
  font-size: 14px;
}
.sub__link:hover {
  background: #fff;
  color: #000;
}

<nav>
 <ul class="nav__cat">
  <li class="nav__li"><a href="">Menu 1</a></li>
  <li class="nav__li"><a href="">Menu 23</a>
   <ul class="sub__category">
     <li class="sub__li">
       <a href="#" class="sub__link">Subcategory</a>
     </li>
      <li class="sub__li">
       <a href="#" class="sub__link">Subcategory 2 </a>
     </li>
      <li class="sub__li">
       <a href="#" class="sub__link">Subcategory 3 </a>
     </li>
    </ul>
   </li>
  <li class="nav__li"><a href="">Menu 345</a>
   <ul class="sub__category">
     <li class="sub__li">
       <a href="#" class="sub__link">Subcategory</a>
     </li>
      <li class="sub__li">
       <a href="#" class="sub__link">Subcategory 2 </a>
     </li>
      <li class="sub__li">
       <a href="#" class="sub__link">Subcategory 3 </a>
     </li>
    </ul>
   </li>
  <li class="nav__li"><a href="">Menu 4567</a></li>
  <li class="nav__li"><a href="">Menu 56789</a></li>
 </ul>
</nav>