先看效果
整体效果
这个效果使用 css 中
animation属性，以及搭配伪元素::after、::before来实现两个圆交替变化。
核心代码
html部分代码
<div>
<label class="dot"></label>
</div>
label标签画圆点主体。
css部分代码
.app{
width: 100%;
height: 100vh;
position: relative;
display: flex;
justify-content: center;
align-items: center;
}
.dot {
width: 48px;
height: 48px;
display: block;
position: relative;
border-radius: 50%;
background-color: blue;
z-index: 1;
}
.dot::after {
width: 100%;
height: 100%;
content: "";
border-radius: 50%;
position: absolute;
top: 0;
left: 0;
z-index: -2;
background-color: blue;
animation: dot-play 4s linear 400ms infinite;
}
.dot::before {
width: 100%;
height: 100%;
content: "";
border-radius: 50%;
position: absolute;
top: 0;
left: 0;
z-index: -1;
background-color: blue;
animation: dot-play 4s linear 200ms infinite;
animation-delay: 2s; /* 延迟 2s */
}
@keyframes dot-play{
from{
transform: scale(1);
opacity: .2;
}
to{
transform: scale(4);
opacity: 0;
}
}
伪元素基于主体圆写出两个蓝色圆形来做水波纹，并设置
animation属性进行变化。
注意：第二个伪元素的圆形，延迟 2s 启动animation动画。
完整代码
html代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css?k3f22ww">
<title>03 圆点水波纹效果</title>
</head>
<body>
<div class="app">
<label class="dot"></label>
</div>
</body>
</html>
css代码
*{
margin: 0;
padding: 0;
list-style: none;
transition: .5s;
}
html,body{
background-color: #f5f5f5;
color: #fff;
font-size: 14px;
}
.app{
width: 100%;
height: 100vh;
position: relative;
display: flex;
justify-content: center;
align-items: center;
}
.dot {
width: 48px;
height: 48px;
display: block;
position: relative;
border-radius: 50%;
background-color: blue;
z-index: 1;
}
.dot::after {
width: 100%;
height: 100%;
content: "";
border-radius: 50%;
position: absolute;
top: 0;
left: 0;
z-index: -2;
background-color: blue;
animation: dot-play 4s linear 400ms infinite;
}
.dot::before {
width: 100%;
height: 100%;
content: "";
border-radius: 50%;
position: absolute;
top: 0;
left: 0;
z-index: -1;
background-color: blue;
animation: dot-play 4s linear 200ms infinite;
animation-delay: 2s; /* 延迟 2s */
}
@keyframes dot-play{
from{
transform: scale(1);
opacity: .2;
}
to{
transform: scale(4);
opacity: 0;
}
}
页面效果
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