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几种下拉菜单的实现

2019-08-20

Javascript, CSS, jQuery

CSS下拉菜单

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS下拉菜单</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #nav{
            background-color:#f14f4f;
            width: 600px;
            height: 48px;
            margin: 0 auto;
        }
        ul{
            list-style: none;
        }
        ul li{
            float: left;
            line-height: 48px;
            text-align: center;
            position: relative;
        }
        a{
            text-decoration: none;
            color: white;
            display: block;
            padding: 0 10px;
        }
        a:hover{
            background-color: pink;
        }
        ul li ul{
            position: absolute;
            left: 0;
            top: 48px;
            display: none;
        }
        ul li ul li{
            float: none;
            background-color: #f14f4f;
            margin-top: 2px;
        }
        ul li ul li a:hover{
            background-color: pink;
        }
        /*鼠标经过时显示二级菜单*/
        ul li:hover ul{
            display: block;
        }
    </style>
</head>
<body>
<div id="nav">
    <ul>
        <li><a href="#">首页</a></li>
        <li><a href="#">学习笔记</a>
            <ul>
                <li><a href="#">javasript</a></li>
                <li><a href="#">jquery</a></li>
            </ul>
        </li>
        <li><a href="#">技术分享</a>
            <ul>
                <li><a href="#">Vue</a></li>
                <li><a href="#">Nodejs</a></li>
            </ul>
        </li>
        <li><a href="#">生活杂记</a></li>
        <li><a href="#">关于我们</a></li>
    </ul>
</div>
</body>
</html>

JS下拉菜单

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JS下拉菜单</title>
    <style type="text/css">
        .menu{
            width:400px;
            margin:100px auto;
        }
        .menu ul{
            list-style: none;
        }
        .menu ul li{
            float:left;
            width:100px;
            height:30px;
            line-height:30px;
            text-align:center;
        }
        .menu a{
            text-decoration:none;
            color:#fff;
            display:block;
            width:100px;
            height:30px;
            background:#f14f4f;
        }
        .menu a:hover{
            background:pink;
        }
        .menu ul ul{
            display:none;
            list-style: none;
            padding-left: 0;
        }
    </style>
</head>
<body>
<div class="menu">
    <ul>
        <li id="li01">
            <a href="javascript:;">艾猫猫</a>
            <ul id="ul01">
                <li><a href="javascript:;">Sweetkitty</a></li>
                <li><a href="javascript:;">Sweetkitty</a></li>
                <li><a href="javascript:;">Sweetkitty</a></li>
                <li><a href="javascript:;">Sweetkitty</a></li>
            </ul>
        </li>
        <li id="li02">
            <a href="javascript:;">艾猫猫</a>
            <ul id="ul02">
                <li><a href="javascript:;">Sweetkitty</a></li>
                <li><a href="javascript:;">Sweetkitty</a></li>
                <li><a href="javascript:;">Sweetkitty</a></li>
                <li><a href="javascript:;">Sweetkitty</a></li>
            </ul>
        </li>
    </ul>
</div>

<script>
    function myFn(param1,param2){
        var myli = document.getElementById(param1);
        var myul = document.getElementById(param2);
        myli.onmouseover = function(){
            myul.style.display = 'block';
        };
        myli.onmouseout = function(){
            myul.style.display = 'none';
        };
    }
    myFn('li01','ul01');
    myFn('li02','ul02');
</script>

</body>
</html>

jQuery下拉菜单

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>jQuery下拉菜单</title>
    <script src="js/jquery-1.12.4.js"></script>
    <style>
        .menu{
            width: 500px;
            margin: 0 auto;
        }
        .menu ul{
            list-style: none;
        }
        .menu ul li{
            float:left;
            width:100px;
            height:30px;
            line-height:30px;
            text-align:center;
        }
        .menu a{
            text-decoration:none;
            color:#fff;
            display:block;
            width:100px;
            height:30px;
            background:#f14f4f;
        }
        .menu a:hover{
            background:pink;
        }
        .menu ul ul{
            display:none;
            list-style: none;
            padding-left: 0;
        }
    </style>
</head>
<body>
<div class="menu">
    <ul>
        <li><a href="#">艾猫猫</a>
            <ul>
                <li><a href="#">Sweetkitty</a></li>
                <li><a href="#">Sweetkitty</a></li>
                <li><a href="#">Sweetkitty</a></li>
            </ul>
        </li>
        <li><a href="#">艾猫猫</a>
            <ul>
                <li><a href="#">Sweetkitty</a></li>
                <li><a href="#">Sweetkitty</a></li>
                <li><a href="#">Sweetkitty</a></li>
            </ul>
        </li>
    </ul>
</div>

<script>
    $(document).ready(function(){
        $('.menu li').mouseenter(function(){
            $(this).children('ul').show();
        });
        $(".menu li").mouseleave(function(){
            $(this).children('ul').hide();
        });
    })

</script>
</body>
</html>

点按式下拉菜单

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>点按式下拉菜单</title>
    <style>
        #clickOpen{
            display: inline-block;
            width: 100px;
            height: 30px;
            background-color:#f14f4f;
            color: white;
            text-align: center;
            line-height: 30px;
        }
        .list{
            display: inline-block;
            list-style: none;
            padding-left: 0px;
            background-color: #f14f4f;
            display: none;
            margin-top: 3px;
            text-align: center;
        }
        .list li{
            width: 100px;
            height: 30px;
            text-align: center;
            line-height: 30px;
        }
        .list a{
            color: white;
            text-decoration: none;
            display: block;
        }
        .list a:hover{
            background-color:pink;
        }
    </style>
</head>
<body>
<div id="clickOpen">
    点击展开
</div>
<br/>
<ul class = "list">
    <li class="item"><a href="javascript:;">艾猫猫</a></li>
    <li class="item"><a href="javascript:;">Sweetkitty</a></li>
</ul>

<script type="text/javascript">
    var clickBtn = document.getElementById('clickOpen');
    var list = document.getElementsByClassName('list')[0];

    var isOpen = false;

    clickBtn.addEventListener('click',function () {
        isOpen = !isOpen;
        if (isOpen){
            clickBtn.innerHTML = '点击隐藏';
            list.style.display = 'inline-block';
        } else{
            clickBtn.innerHTML = '点击展开';
            list.style.display = 'none';
        }
    })
</script>

</body>
</html>