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Jun 24, 2016 am 11:46 AM

Drop-down menu effect

I have introduced to you some cool effects in HTML before. This article will introduce to you some drop-down menu effects that you can often see on websites. This menu effect It is generally divided into two layers. When our mouse passes through the first-level menu, the hidden second-level menu will be displayed. This ensures the beauty of the page without reducing the number of modules on the page, and can even increase the number of modules.

1. Without further ado, let’s use HTML CSS to achieve the above effect for you. First of all, please appreciate the rendering:

1. Interface layout code:

<body>     <div id="var">        <ul>            <li><a href="#">首页</a></li>            <li><a href="#">软件工程</a>                <ul>                    <li><a href="#">JAVA</a></li>                    <li><a href="#">NET</a></li>                </ul>            </li>            <li><a href="#">通信工程</a></li>            <li><a href="#">计算机管理</a>                <ul>                    <li><a href="#">JAVA</a></li>                    <li><a href="#">NET</a></li>                </ul>            </li>            <li><a href="#">物联网系</a></li>        </ul>    </div>      </body>

2. CSS code:

<style type="text/css">        *{padding: 0; margin: 0;}        #var{background-color: #eee; width: 600px; height: 40px; margin: 0 auto;}        ul{list-style: none;}        ul li{float: left; line-height: 40px; text-align: center; position: relative;}        a{ text-decoration: none; color:#000; display: block; padding:0 10px; height: 40px;}        a:HOVER {color: #fff; background-color: #666;}        ul li ul li{float: none; background-color: #eee; margin-top: 2px;}        ul li ul{ position: absolute; left: 0px; top:40px; display: none;}        ul li ul li a:HOVER { background-color: #06f;}        ul li:hover ul{ display: block;}    </style>

The CSS code is the most basic, I think Everyone can understand it. Some of them may seem a bit difficult. Let me analyze it with you. This code: list-style:none; means to remove the style, that is, remove the small black dots in front of each li. ; For text-decoration: none under a, it means removing the underline under the hyperlink; a:hover means the effect of the mouse passing over the hyperlink; display: block; means converting ul into a block-level element. The others are some general attributes, so I won’t go into details. As long as you understand the concept of the box model, this is not a problem.

2. HTML css javascript to achieve the above effect:

3. Interface code:

<body>    <div id="var">        <ul>            <li><a href="#">首页</a></li>            <li onmouseover="show(this)" onmouseout="quit(this)"><a href="#">软件工程</a>                <ul>                    <li><a href="#">JAVA</a></li>                    <li><a href="#">NET</a></li>                </ul>            </li>            <li><a href="#">物联网工程</a></li>            <li onmouseover="show(this)" onmouseout="quit(this)"><a href="#">信息管理</a>                <ul>                    <li ><a href="#">JAVA</a></li>                    <li><a href="#">NET</a></li>                </ul>            </li>            <li><a href="#">网络安全</a></li>            <li><a href="#">计算机科学与技术</a></li>        </ul>    </div>  </body>

4. css code:

<style type="text/css">        *{ margin: 0; padding: 0;}        #var{background-color: #eee; width: 600px; height: 40px; margin: 0 auto;}        ul{list-style: none;}        ul li{ float: left; line-height: 40px; text-align: center;  position: relative;}        a{ text-decoration: none; padding:0 10px; height: 40px; color:#000; display: block;}        a:HOVER { color: #fff; background-color: #666;}        ul li ul li{ float: none; background-color: #eee; margin-top: 2px;}        ul li ul{ position: absolute; left: 0px; top:40px; display: none;}        ul li ul li a:HOVER{ background-color: #06f;}    </style>

5. JavaScript to achieve the above effects:

    <script type="text/javascript">        function show(li){            var submenu = li.getElementsByTagName("ul")[0];            submenu.style.display="block";//鼠标经过时显示二级菜单        }        function quit(li){            var submenu = li.getElementsByTagName("ul")[0];            submenu.style.display="none";//鼠标离开时隐藏二级菜单        }    </script>

3. Implementation of change menu, interface appreciation:

🎜>

6. Interface code:

<body>    <div id="var">        <ul>            <li><a id="a1" href="#">首页<span>index</span></a></li>            <li><a href="#">课程大厅<span>home</span></a></li>            <li><a href="#">学习中心<span>study</span></a></li>            <li><a href="#">关于我们<span>me</span></a></li>            <li><a href="#">论坛<span>say</span></a></li>        </ul>    </div>  </body>

7. CSS code:

　　<style type="text/css">        *{ padding: 0px; margin: 0px;}        #var{ font-size: 12px; font-weight: bold; border-bottom: 8px solid #666; overflow: auto;}        #var li{ float: left; margin-left: 1px;  list-style: none;}        #var li a{ line-height: 20px; text-decoration: none; background-color: #ddd; color: #666; display: block; width: 80px; text-align: center;}        #var li a span{ display: none;}        #var li a:HOVER{ margin-top: -20px; background-color: #666; color: #fff;}        #var li a:HOVER span{ display: block;}    </style>

Let’s talk about this article I believe everyone has learned the menu bar design in this article. Have you ever felt the power of CSS? Anyway, I am convinced. As a website development engineer, if you say that you don’t understand SCC, you will probably be laughed out of your face. If you have any objections to the above content, please leave a message.

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