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HTML连载71-翻转菜单练习

2020-02-28 16:00:45来源：博客园阅读 ()

HTML连载71-翻转菜单练习

一、翻转菜单练习?

 

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>D174_OverturnMenu</title>

    <style>

        *{

            margin:0;

            padding:0;

        }

        ul{

            width: 400px;

            height: 40px;

            margin:0 auto;

            margin-top: 100px;

            background-color: yellow;

        }

        .nav>li {

            list-style: none;

            float:left;

            width: 120px;

            height: 40px;

            margin-left:10px;

            background-color: green;

            line-height: 40px;

            text-align: center;

        }

        .sub{

            /*display: none;!*代表不显示元素*!*/

        }

        .sub>li{

            list-style: none;

            background-color: red;

            transform:rotateY(180deg);

            transition:all;

            /*opacity: 0;!*透明度，取值0-1*!*/

?

        }

        .nav>li:hover .sub li{

            transform:none;

        }

        .nav>li:hover .sub li:nth-child(1){

            transform:none;

            transition-delay:200ms;

        }

        .nav>li:hover .sub li:nth-child(2){

            transform:none;

            transition-delay:400ms;

        }

        .nav>li:hover .sub li:nth-child(3){

            transform:none;

            transition-delay:600ms;

        }

        .nav>li .sub li:nth-child(3){

            transform:none;

            transition-delay:200ms;

        }

        .nav>li .sub li:nth-child(2){

            transform:none;

            transition-delay:400ms;

        }

        .nav>li .sub li:nth-child(1){

            transform:none;

            transition-delay:600ms;

        }

</style>

</head>

<body>

<ul class="nav" >

    <li>一级菜单

        <ul class="sub">

            <li>二级菜单</li>

            <li>二级菜单</li>

            <li>二级菜单</li>

        </ul>

    </li>

    <li>一级菜单</li>

    <li>一级菜单</li>

</ul>

</body>

</html>