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【CSS】带箭头的二级菜单页面

本文主要是介绍【CSS】带箭头的二级菜单页面，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！ 
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .box {
            width: 600px;
            height: 40px;
            line-height: 50px;
            background: #ffa4b2;
            text-align: center;
            color: white;
            font-size: 20px;
        }

        span {
            width: 0;
            height: 0;
            /*background: white;*/
            border: 5px solid transparent;
            border-top: 5px solid #ffffff;
            display: inline-block;
            position: relative;
            top: 2.5px;
            left: 8px;
        }

        .item ul {
            list-style: none;
            padding: 10px;
        }
        .box:hover span {
            border: 5px solid transparent;
            border-bottom: 5px solid #ffffff;
            top: -2.5px;
        }

        .box .item {
            float: left;
            width: 148px;
            color: #f0f0f0;
            line-height: 40px;
            text-align: center;

        }

        .item:hover {
            background: lightblue;
        }
        li{

        }
        /* > 子代选择器*/
        .item > ul {
            display: none;
            background: lightblue;
            color: white;
        }

        .item:hover ul {
            display: block;
        }

        .item li:hover {
            color: blue;
        }
    </style>
</head>
<body>
<div class="box">
    <div class="item">导航1<span></span>
        <ul>
            <li>Java教程</li>
            <li>Python教程</li>
            <li>HTML教程</li>
        </ul>
    </div>
    <div class="item">导航2<span></span>
        <ul>
            <li>Java教程</li>
            <li>Python教程</li>
            <li>HTML教程</li>
        </ul>
    </div>
    <div class="item">导航3<span></span>
        <ul>
            <li>Java教程</li>
            <li>Python教程</li>
            <li>HTML教程</li>
        </ul>
    </div>
    <div class="item">导航4<span></span>
        <ul>
            <li>Java教程</li>
            <li>Python教程</li>
            <li>HTML教程</li>
        </ul>
    </div>
</div>
</body>
</html>

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