直接上代碼，有註釋
index.html
<!doctype html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>水波紋loading</title>
<style>
html {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
margin: 0;
padding: 0;
/*這三句讓彈性盒子內容絕對居中*/
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #222;
}
/*不讓svg佔據盒子空間*/
svg {
width: 0;
height: 0;
}
.loader {
position: relative;
/*border: 1px solid silver;*/
width: 200px;
height: 200px;
/*URL函數接受一個XML文件，該文件設置了 一個SVG濾鏡，且可以包含一個錨點來指定一個具體的濾鏡元素。
這裏是 filter: url(svg-url#element-id)*/
filter: url(#gooey);
}
.loader > span {
position: absolute;
display: block;
top: 0;
left: 0;
width: 100%;
height: 100%;
/*background-color: #fff;*/
animation: loader 4s ease-in-out infinite;
/*動畫延時：這裏給calc計算屬性，每個span延時*/
animation-delay: calc(0.2s * var(--i));
}
.loader > span:before {
content: '';
position: absolute;
display: block;
top: 0;
width: 40px;
height: 40px;
/*這兩句讓元素水平居中*/
left: 50%;
transform: translateX(-50%);
/*圓*/
border-radius: 50%;
box-shadow: 0 0 30px #03a9f4;
background-image: linear-gradient(#fce4ec, #03a9f4);
}
/*所有的span盒子進行該動畫*/
@keyframes loader {
0% {
transform: rotate(0deg);
}
50%, 100% {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="loader">
<span style="--i:1"></span>
<span style="--i:2"></span>
<span style="--i:3"></span>
<span style="--i:4"></span>
<span style="--i:5"></span>
<span style="--i:6"></span>
<span style="--i:7"></span>
</div>
<svg>
<filter id="gooey">
<feGaussianBlur in="SourceGraphic" stdDeviation="10"></feGaussianBlur>
<feColorMatrix values="1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 20 -10">
</feColorMatrix>
</filter>
</svg>
</body>
</html>
效果圖
