效果图：
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>loading</title>
</head>
<style type="text/css">
.box{
100%;
margin: 50px auto;
padding: 3%;
overflow: hidden;
box-sizing: border-box;
background-color: #cccccc;
}
.load{
300px;
height: 200px;
border: 1px gray solid;
display: flex;
align-items: center;
justify-content: center;
box-sizing: border-box;
float: left;
background-color: #eeeeee;
margin-left: 45px;
}
.loading{
position: relative;
}
.loading i{
15px;
height: 15px;
background-color: black;
border-radius: 50%;
display: block;
position: absolute;
}
.loading2 >i{
3px;
height: 30px;
background-color: #333333;
border-radius: 2px;
display: inline-block;
float: left;
margin-left: 10px;
}
.loading2 i:nth-child(1){
-webkit-animation: shrink 1s linear 0s infinite;
}
.loading2 i:nth-child(2){
-webkit-animation: shrink 1s linear 0.2s infinite;
}
.loading2 i:nth-child(3){
-webkit-animation: shrink 1s linear 0.4s infinite;
}
.loading2 i:nth-child(4){
-webkit-animation: shrink 1s linear 0.6s infinite;
}
.loading2 i:nth-child(5){
-webkit-animation: shrink 1s linear 0.8s infinite;
}
@keyframes shrink {
50%{transform: scale(.5)}
100%{transform: scale(1)}
}
.loading i:nth-child(1){
top: 25px;
left: 0;
-webkit-animation: loading 1s ease 0s infinite;
}
.loading i:nth-child(2){
top: 17px;
left: 17px;
-webkit-animation: loading 1s ease 0.84s infinite;
}
.loading i:nth-child(3){
top: 0px;
left: 25px;
-webkit-animation: loading 1s ease 0.72s infinite;
}
.loading i:nth-child(4){
top: -17px;
left: 17px;
-webkit-animation: loading 1s ease 0.60s infinite;
}
.loading i:nth-child(5){
top: -25px;
left: 0px;
-webkit-animation: loading 1s ease 0.48s infinite;
}
.loading i:nth-child(6){
top: -17px;
left: -17px;
-webkit-animation: loading 1s ease 0.36s infinite;
}
.loading i:nth-child(7){
top: 0px;
left: -25px;
-webkit-animation: loading 1s ease 0.24s infinite;
}
.loading i:nth-child(8){
top: 17px;
left: -17px;
-webkit-animation: loading 1s ease 0.12s infinite;
}
@keyframes loading {
50%{transform: scale(0.4);opacity: 0.4}
100%{transform: scale(1);opacity: 1}
}
.loading3{
position: relative;
60px;
height: 60px;
}
.loading3 > i{
display: block;
60px;
height: 60px;
border-radius: 50%;
background-color: #333333;
position: absolute;
left: 0px;
top: 0px;
opacity: 0;
}
@keyframes dot {
0%{
transform: scale(0);
opacity: 0;
}
5%{
opacity: 1;
}
100%{
transform: scale(1);
opacity: 0;
}
}
.loading3 i:nth-child(1){
-webkit-animation: dot 1s linear 0s infinite;
}
.loading3 i:nth-child(2){
-webkit-animation: dot 1s linear 0.2s infinite;
}
.loading3 i:nth-child(3){
-webkit-animation: dot 1s linear 0.4s infinite;
}
</style>
<body>
<div class="box">
<div class="load">
<div class="loading">
<i></i>
<i></i>
<i></i>
<i></i>
<i></i>
<i></i>
<i></i>
<i></i>
</div>
</div>
<div class="load">
<div class="loading2">
<i></i>
<i></i>
<i></i>
<i></i>
<i></i>
</div>
</div>
<div class="load">
<div class="loading3">
<i></i>
<i></i>
<i></i>
</div>
</div>
</div>
</body>
</html>