<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>css之transition动画效果</title>
<style>
body,html{
position: relative;
}
#root{
position: relative;
top: 200px;
left: calc(50% - 150px);
width: 300px;
height: 300px;
background-color: yellow ;
overflow: hidden;
}
#root:hover #box{
top: 0;
}
#box{
width: 300px;
height: 300px;
background-color: skyblue;
position: absolute;
top: -100%;
transition: all ease-in 2s;
}
#box button {
position: absolute;
bottom: 0;
right: 0;
}
#box:active{
background-color: red;
}
</style>
</head>
<body>
<div id="root">
<div id="box">
<button onclick="toBuy()">购买</button>
</div>
</div>
</body>
</html>
<script>
function toBuy(){
alert('购买成功')
}
</script>