JavaScript（js）网页--下拉菜单制作

梦里梦外; 2022-12-22 11:09 187阅读 0赞

# JavaScript（js）网页–下拉菜单制作 #

在网页的设计中，经常会出现二级下拉菜单，当鼠标经过时，显示二级菜单，鼠标离开时隐藏。例如新浪网

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center]

鼠标放到微博、博客或邮箱上面时，会出现一个二级菜单，鼠标离开则隐藏。

设计简单的下拉菜单栏

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 1]

<!DOCTYPE html>
    <html lang="zh-CN">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>下拉菜单</title>
        <style>
            *{
         
                margin: 0;
                padding: 0;
                
            }
            a{
         
                text-decoration: none;
                
            }
            div {
         
                width: 1200px;
                height: 30px;
                margin: 0px auto;
                background-color: blanchedalmond;
            }
            li {
         
                list-style: none;
            }
            div li {
         
                position: relative;
                float: right;
                text-align: center;
                border: 1px solid black;
                line-height: 30px;
                width: 80px;
                height: 30px;
            }
            div ul {
         
                position: absolute;
                top:30px;
                display: none;
            }
            div ul li{
         
                
                float: left;
                width: 120px;
                height: 30px;
                background-color: pink;
            }
        </style>
    </head>
    <body>
        <div>
            <li><a href="#">邮箱</a>
                <ul>
                    <li><a href="#">免费邮箱</a></li>
                    <li><a href="#">VIP邮箱</a></li>
                    <li><a href="#">企业邮箱</a></li>
                    <li><a href="#">新浪邮箱客户端</a></li>
                </ul>
            </li>
            <li><a href="#">博客</a>
                <ul>
                    <li><a href="#">博客评论</a></li>
                    <li><a href="#">来读提醒</a></li>
                </ul>
            </li>
            <li><a href="#">微博</a>
                <ul>
                    <li><a href="#">私信</a></li>
                    <li><a href="#">评论</a></li>
                    <li><a href="#">@我</a></li>
                </ul>
            </li>
            <li ><a href="#">登录</a></li>
    
        </div>
        <script>
            var div = document.querySelector('div');
            var lis = div.children;
            for (var i=0;i<lis.length;i++){
         
                //鼠标经过，出现下拉菜单
                lis[i].onmouseover=function(){
         
                    this.children[1].style.display='block';
                }
                //鼠标离开，隐藏下拉菜单
                lis[i].onmouseout=function(){
         
                    this.children[1].style.display='none';
                }
            }
    
        </script>
    </body>
    </html>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center]: /images/20221120/43a94f266cac46b3a5dc50cb9ff169d0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjU3OTM0OA_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20221120/dd5a2ee344a648ca988c6211023ae9b1.png