CSS+JS实现水滴涟漪动画按钮效果的示例代码

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代码如下所示：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .btn{ 
            display: block; 
            width: 300px; 
            height: 100px;
            margin: 50px; 
            outline: 0; 
            overflow: hidden;  
            position: relative; 
            transition: .3s; 
            cursor: pointer; 
            user-select: none;  
            text-align: center; 
            line-height: 100px; 
            font-size: 50px; 
            background: tomato; 
            color: #fff;  
            border-radius: 10px;
        }
        .btn>span{ 
            position: absolute; 
            left: 0; 
            top: 0;
            width: 100%; 
            height: 100%;}
        .btn>span:after{ 
            content: ''; 
            position: absolute; 
            background: transparent; 
            border-radius:50%; 
            width: 100%; 
            padding-top: 100%; 
            margin-left: -50%; 
            margin-top: -50%; 
            left: var(--x,-100%); 
            top: var(--y,-100%); 
        }
        .btn:active{ 
            background: orangered;
        }
        .btn>input[type=checkbox]{
            display: none
        }
        .btn>input[type=checkbox]+span:after{
            animation: ripple-in 1s;
        }
        .btn>input[type=checkbox]:checked+span:after{
            animation: ripple-out 1s;
        }
        @keyframes ripple-in{
            from {
                transform: scale(0);
                background: rgba(0,0,0,.25)
            }
            to {
                transform: scale(1.5);
                background: transparent
            }
        }
        @keyframes ripple-out{
            from {
                transform: scale(0);
                background: rgba(0,0,0,.25)
            }
            to {
                transform: scale(1.5);
                background: transparent
            }
        }
    </style>
</head>
<body>
    <label class="btn" tabindex="1">
        <input type="checkbox"><span onclick="ripple(this,event)">button</span>
    </label>
</body>

<script>
    function ripple(dom,ev){
        console.log(ev)
        var x = ev.offsetX;
        var y = ev.offsetY;
        dom.style.setProperty('--x',x+'px');
        dom.style.setProperty('--y',y+'px');
}
</script>
</html>