HTML DOM classList 属性的使用

先上一个案例

<!DOCTYPE html>
<html lang="zh-cn">

<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>Document</title>

    <style>
        html,
        body {
            margin: 0;
            padding: 0;
        }

        .container {
             100%;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #84a0f4;
            background-image: linear-gradient(to top, #84a0f4 0%, #c2e9fb 100%);
            font-family: "Montserrat", sans-serif;
        }

        .wrapper {
            position: relative;
        }

        #btn_click {
             100px;
            height: 35px;

            position: relative;
            background-color: #5c67ff;
            border-radius: 20px;
            box-shadow: 0px 0px 0px 4px rgb(92 103 255 / 30%);

            display: flex;
            justify-content: center;
            align-items: center;

            font-size: 14px;
            color: white;

            cursor: pointer;
            transition: all 0.2s linear;

            z-index: 9;
        }

        #btn_click:hover {
            background-color: #2d3aef;
            color: white;
        }

        .dialog {
            position: absolute;
            left: -95px;
            bottom: 20px;
             120px;
            background-color: white;
            border-radius: 10px;
            padding: 0 20px;
            box-sizing: border-box;
            box-shadow: 0px 0px 0px 4px rgb(92 103 255 / 30%);
            transition: all 0.3s ease 0.1s;

            opacity: 0;
            transform: scale(0);
            transform-origin: bottom right;
        }

        .dialog p {
            opacity: 0;
            text-align: center;
            color: #1c3991;
        }

        .active {
            opacity: 1;
            transform: scale(1);
            animation: popple 1s infinite;
        }

        .active p {
            animation: fadeInItem .6s .2s forwards;
        }

        .active p:nth-child(1) {
            animation-delay: .2s;
        }

        .active p:nth-child(2) {
            animation-delay: .4s;
        }

        .active p:nth-child(3) {
            animation-delay: .6s;
        }

        .active p:nth-child(4) {
            animation-delay: .8s;
        }


        @keyframes fadeInItem {
            100% {
                transform: translatex(0px);
                opacity: 1;
            }
        }


        @keyframes popple {
            0% {
                box-shadow: 0px 0px 0px 4px rgba(92, 103, 255, 0.3);
            }

            50% {
                box-shadow: 0px 0px 0px 10px rgba(92, 103, 255, 0.3);
            }

            100% {
                box-shadow: 0px 0px 0px 4px rgba(92, 103, 255, 0.3);
            }
        }
    </style>
</head>

<body>
    <div class="container">

        <div class="wrapper">
            <div id='btn_click'>CLICK</div>
            <div class="dialog">
                <p>设置</p>
                <p>复制</p>
                <p>粘贴</p>
                <p>截切</p>
            </div>
        </div>
    </div>

</body>
<script>
    var func = function () {
        let dialog = document.querySelector(".dialog").classList.toggle('active')
    }

    document.getElementById('btn_click').addEventListener('click', func);



</script>

</html>

// 其中这一句控制菜单的显示与隐藏，很简洁的语法，以后可能会经常用到
document.querySelector(".dialog").classList.toggle('active')

HTML DOM classList 属性的使用

先上一个案例

还有些其他属性

其他属性文档：https://www.runoob.com/jsref/prop-element-classlist.html

源代码参考于：https://codepen.io/aybukeceylan/pen/zYNpWdj