<div class="button">
<span>鼠标移过来试试</span>
</div>
写出来的效果是这样的：
640.gif
直接上css和js啦
<style>
.button {
position: relative;
appearance: none;
background: #f72359;
padding: 1em 2em;
border: none;
color: white;
font-size: 1.2em;
cursor: pointer;
outline: none;
overflow: hidden;
border-radius: 100px;
}
.button span {
position: relative;
}
.button::before {
--size: 0;
content: '';
position: absolute;
left: var(--x);
top: var(--y);
width: var(--size);
height: var(--size);
background: radial-gradient(circle closest-side, #4405f7, transparent);
transform: translate(-50%, -50%);
transition: width .2s ease, height .2s ease;
}
.button:hover::before {
--size: 400px;
}
</style>
<script type="text/javascript">
document.querySelector('.button').onmousemove = (e) => {
const x = e.pageX - e.target.offsetLeft
const y = e.pageY - e.target.offsetTop
e.target.style.setProperty('--x', `${ x }px`)
e.target.style.setProperty('--y', `${ y }px`)
}
</script>
样式中涉及的css变量正在大量普及，js的es6写法也值得学习。
本文借鉴：https://mp.weixin.qq.com/s/0uNQxcEG6m1LQrzUlVLW3A?tdsourcetag=s_pcqq_aiomsg
