<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
button{
width: 150px;
height: 40px;
font: 20px / 40px "微软雅黑";
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
border-radius: 10px;
background: lightcoral;
color: #fff;
border: 2px solid rgb(185, 86, 86);
outline: none;
}
aside{
width: 100vw;
height: 50px;
font: 22px / 50px "微软雅黑";
background: rgba(0,0,0,.5);
color: #fff;
text-align: center;
transform: translateY(-50px);
transition: .5s;
}
</style>
</head>
<body>
<aside>请输入姓名后再提交</aside>
<button>
提交
</button>
<script>
var btn = document.querySelector('button');
var aside = document.querySelector('aside');
btn.onclick = function(){
aside.style.transform = 'translateY(0px)';
setTimeout(function(){
aside.style.transform = 'translateY(-50px)';
},1000);
}
</script>
</body>
</html>
