css 实现三级联动菜单

昨天因为项目中想要把二级联动菜单改成三级联动菜单，所以我就单独写了一个tab导航栏，用纯css的方式实现的三级联动。一开始我想着可以用js实现，但是js的hover事件和mouseenter,mouseover,mouseleave,mouseout事件都会有一个问题，就是当鼠标移出区域块儿的时候，我们希望弹出来的二级菜单和三级菜单可能不会像我们希望的显示隐藏。所以，我们可以用css3的伪类元素实现。

大家可以去我的gitHub上去看demo,我把网址贴一下：https://github.com/dreamITGirl/projectStudy/blob/master/html/%E5%88%86%E7%BA%A7%E8%81%94%E5%8A%A8%E8%8F%9C%E5%8D%95%E6%A0%8F.html

顺便再把效果图贴一下：

代码如下

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0"/>
    <title>菜单栏</title>
    <style>
        html, body, ul, li {
            margin: 0;
            padding: 0;
            font-family: "微软雅黑", Helvetica, Arial, sans-serif;
        }

        ul, li {
            list-style: none;
        }

        .top {
            background: #4db3a4;
            height: 34px;
            width: 100%;
            padding: 0 10%;
            box-sizing: border-box;
        }

        .main-nav {
            display: flex;
            line-height: 34px;
        }

        .two-nav {
            background: #4db3a4;
            position: relative;
            display: none;
        }

        .three-nav {
            background: #4db3a4;
            position: absolute;
            top: 0;
            right: -116px;
            display: none;
        }

        .item-nav, .two-item, .three-item {
            width: 126px;
            text-align: center;
        }

        .item-nav > a, .two-item > a, .three-item > a {
            text-decoration: none;
            color: #fff;
        }

        .none {
            display: none;
        }
        .item-nav:hover > .two-nav {
            display: block;
        }

        .two-item:hover > .three-nav {
            display: block;
        }

        .item-nav:hover, .two-item:hover, .three-item:hover {
            background: #44a597;
        }
    </style>
</head>
<body>
<div class="top">
    <ul class="main-nav">
        <li class="item-nav">
            <a href="javascript:;">我的行程</a>
        </li>
        <li class="item-nav">
            <a href="javascript:;">ES管理员</a>
            <ul class="two-nav none">
                <li class="two-item">
                    <a href="javascript:;">ES差旅预订</a>
                    <ul class="three-nav none">
                        <li class="three-item">
                            <a href="javascript:;">ES差旅1</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">2</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">3</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">4</a>
                        </li>
                    </ul>
                </li>
                <li class="two-item">
                    <a href="javascript:;">ES差旅</a>
                    <ul class="three-nav none">
                        <li class="three-item">
                            <a href="javascript:;">酒店账单</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">飞机账单</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">火车账单</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">全部账单</a>
                        </li>
                    </ul>
                </li>
            </ul>
        </li>
        <li class="item-nav">
            <a href="javascript:;">差旅报表</a>

        </li>
        <li class="item-nav">
            <a href="javascript:;">差旅审批</a>
            <ul class="two-nav none">
                <li class="two-item">
                    <a href="javascript:;">酒店账单</a>
                    <ul class="three-nav none">
                        <li class="three-item">
                            <a href="javascript:;">酒店账单</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">飞机账单</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">火车账单</a>
                        </li>
                        <li class="three-item">
                            <a href="javascript:;">全部账单</a>
                        </li>
                    </ul>
                </li>
            </ul>
        </li>
    </ul>
</div>
</body>
</html>

 

posted @ 2018-08-29 10:48  前端加油站  阅读(886)  评论(0)  编辑  收藏  举报