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JS下拉栏(萌新版)（js实现下拉框）

ccvgpt 2024-07-19 12:48:33 基础教程 16 ℃ 
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>js下拉栏</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        li{
            list-style: none;
            text-align: center;
        }
        .box>ul{
            width: 120px;
            background-color: gray;
        }
        .box>li {
            width: 120px;
            display: inline-block;
            background-color: aqua;
            position: relative;
        }
        .box>li>ul{
            width: 120px;
            position: absolute;
            display: none;
            background-color: pink;
        }
        .box>li>ul>li:hover{
            background-color: deeppink;
        }
    </style>
</head>

<body>
    <ul class="box">
        <li>asdf
            <ul>
                <li>1</li>
                <li>2</li>
                <li>3</li>
            </ul>
        </li>
        <li>asdf
            <ul>
                <li>4</li>
                <li>5</li>
                <li>6</li>
            </ul>
        </li>
        <li>asdf
            <ul>
                <li>7</li>
                <li>8</li>
                <li>9</li>
            </ul>
        </li>
    </ul>
</body>

</html>
<script>
    let $ = element => document.getElementsByClassName(element.substring(1, element.length));
    var lis = $(".box")[0].children;
    for (let i = 0; i < lis.length; i++) {
        lis[i].onmouseover = function () {
            this.getElementsByTagName('ul')[0].style.display = 'block';
        }
        lis[i].onmouseout = function () {
            this.getElementsByTagName('ul')[0].style.display = 'none';
        }
    }
</script>

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