主要用到了CSS3动画以及CSS3 转换。
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box {
margin: 50px 50px;
position: relative;
width: 350px;
height: 200px;
}
.head {
position: relative;
width: 200px;
height: 200px;
background-color: white;
border-radius: 50%;
overflow: hidden;
}
.head::before,
.head::after {
position: absolute;
z-index: 1;
left: 0;
content: '';
width: 200px;
height: 100px;
background-color: orangered;
}
.head::before {
top: 0;
transform-origin: 100px 100px;
animation: top .5s linear infinite alternate;
}
.head::after {
top: 100px;
transform-origin: 100px 0px;
animation: bottom .5s linear infinite alternate ;
}
.dot {
position: absolute;
left: 100px;
top: 50%;
transform: translateY(-50%);
width: 15px;
height: 15px;
border-radius: 50%;
background-color: red;
box-shadow: 50px 0 0 orange, 100px 0 0 orange, 150px 0 0 orange,200px 0 0 orange;
animation: eat .5s linear infinite;
}
@keyframes top {
0% {
transform: rotate(-30deg);
}
100% {
transform: rotate(0deg);
}
}
@keyframes bottom {
0% {
transform: rotate(30deg);
}
100% {
transform: rotate(0deg);
}
}
@keyframes eat {
100% {
left: 0;
}
}
</style>
</head>
<body>
<div class="box">
<div class="head"></div>
<div class="dot"></div>
</div>
</body>
</html>效果图：