如何使用CSS實現的大型下拉式功能表

下拉式功能表在很多網頁中都能應用到，這篇文章主要介紹了純CSS實現的大型下拉式功能表的範例程式碼的相關資料，內容挺不錯的，現在分享給大家，也給大家做個參考。

這是一款純CSS實現的大型下拉式功能表。該大型菜單使用HTML和純CSS代碼製作，沒有任何js代碼，不依賴任意第三方外掛程式。適合用於欄目分類較多的大型網站使用。

HTML結構

該大型菜單的HTML結構如下：

<nav>  <ul class="container ul-reset">    <li><a href='#'>Home</a></li>    <li class='droppable'>      <a href='#'>Category One</a>      <p class='mega-menu'>        <p class="container cf">          <ul class="ul-reset">            <h3>Heading 1</h3>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>          </ul><!-- .ul-reset -->          <ul class="ul-reset">            <h3>Heading 2</h3>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>          </ul><!-- .ul-reset -->          <ul class="ul-reset">            <h3>Heading 3</h3>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>            <li><a href='#'>Category One Sublink</a></li>          </ul><!-- .ul-reset -->          <ul class="ul-reset">            <h3>Heading 4</h3>            <li><img src="http://placehold.it/205x172"></li>          </ul>        </p><!-- .container -->      </p><!-- .mega-menu -->    </li><!-- .droppable -->    <li class='droppable'>      <a href='#'>Category Two</a>      <p class='mega-menu'>        <p class="container cf">          <ul class="ul-reset">            <h3>Heading 1</h3>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>          </ul><!-- .ul-reset -->          <ul class="ul-reset">            <h3>Heading 2</h3>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>          </ul><!-- .ul-reset -->          <ul class="ul-reset">            <h3>Heading 3</h3>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>          </ul><!-- .ul-reset -->          <ul class="ul-reset">            <h3>Heading 4</h3>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>            <li><a href='#'>Category Two Sublink</a></li>          </ul><!-- .ul-reset -->        </p><!-- .container -->      </p><!-- .mega-menu-->    </li><!-- .droppable -->    <li><a href='#'>Category Three</a></li>    <li><a href='#'>Category Four</a></li>    <li><a href='#'>Category Five</a></li>    <li><a href='#'>Category Six</a></li>  </ul><!-- .container .ul-reset --></nav>

CSS

為該大型菜單添加下面的CSS樣式：

/* #Resets–––––––––––––––––––––––––––––––––––––––––––––––––– */html {box-sizing: border-box;}*, *:before, *:after {box-sizing: inherit;  }/* #Universal and Default Styles–––––––––––––––––––––––––––––––––––––––––––––––––– */body {    background: url(../img/black-wood-small.jpg);    color: #ddd;    font-family: "Open Sans", sans-serif;    font-size: 14px;  line-height: 1;  margin: 0;  padding: 0;  text-align: center;}a {text-decoration: none;}h1 {  font-size: 40px;    font-weight: 700;  margin-bottom: 20px;    margin-top: 20px;}h2 {  font-size: 15px;    font-weight: 600;  margin-bottom: 30px;    margin-top: 10px;}.container {  margin: auto;  width: 940px;}.ul-reset {  padding-left: 0;   margin-top: 0;   margin-bottom: 0;  list-style: none;}/* #Navigation Styles–––––––––––––––––––––––––––––––––––––––––––––––––– */nav {  background: #424242;  font-size: 0;  position: relative;}nav > ul > li {  display: inline-block;    font-size: 14px;    padding: 0 15px;    position: relative;}nav > ul > li:first-child {padding-left: 0;}nav > ul > li:last-child {padding-right: 0;}nav > ul > li > a {  color: #fff;    display: block;    position: relative;    padding: 20px 0;    border-bottom: 3px solid transparent;}nav > ul > li:hover > a {  color: #69aae0;     border-bottom: 3px solid #69aae0;}/* #Mega Menu Styles–––––––––––––––––––––––––––––––––––––––––––––––––– */.mega-menu {  background: #f0f0f0;    display: none;    left: 0;    position: absolute;    text-align: left;    width: 100%;}.mega-menu h3 {color: #444;}.mega-menu ul {  float: left;    margin-bottom: 20px;    margin-right: 40px;    width: 205px;}.mega-menu ul:last-child {margin-right: 0;}.mega-menu a {  border-bottom: 1px solid #ddd;    color: #4ea3d8;    display: block;    padding: 10px 0;}.mega-menu a:hover {color: #2d6a91;}/* #Droppable Class Styles–––––––––––––––––––––––––––––––––––––––––––––––––– */.droppable {position: static;}.droppable > a:after {  content: "\f107";    font-family: FontAwesome;    font-size: 12px;    padding-left: 6px;    position: relative;    top: -1px;}.droppable:hover .mega-menu {display: block;}/* #Browser Clearfix–––––––––––––––––––––––––––––––––––––––––––––––––– */.cf:before,.cf:after {  content: " "; /* 1 */   display: table; /* 2 */}.cf:after {clear: both;}

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