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>
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