纯css写一个带动画的弹框 visibility + opcity
css能实现各种各样的动态效果，比js实现简单，性能也比js实现高，现在我们就用纯css实现弹窗，主要用到了两个属性 opcity 和 visibility，
opctiy 这个属性很简单 控制元素透明度 ，visibility控制元素的显示和隐藏，他和display有一个很重要的区别，visibility可以用transition来进行过渡,而display并不可以，这就是我们不用display的原因
可以配合上transform: scale() 让弹窗更有动态感觉
全部代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>纯css弹窗动画</title>
</head>
<style>
* {
margin: 0;
padding: 0;
}
.alert-box {
top: 0;
left: 0;
z-index: 999;
position: fixed;
width: 100vw;
height: 100vh;
background-color: rgba(0, 0, 0, 0.3);
display: flex;
justify-content: center;
align-items: center;
font-size: 16px;
visibility: hidden;
opacity: 0;
transition: all 0.3s ease-in-out;
}
.alert-content {
height: 130px;
width: 300px;
background-color: #ffffff;
border-radius: 10px;
padding: 12px 18px;
transform: scale(0.8);
transition: all 0.3s ease-in-out;
}
.alert-title {
height: 50px;
line-height: 50px;
font-size: 18px;
}
.alert-info {
height: 50px;
line-height: 50px;
font-size: 16px;
}
.alert-buttons {
display: flex;
justify-content: flex-end;
font-size: 16px;
}
.alert-buttons>div {
height: 30px;
line-height: 30px;
margin-left: 17px;
width: 56px;
text-align: center;
font-size: 16px;
border-radius: 3px;
cursor: pointer;
}
.alert-submit {
background: #409eff;
color: #fff;
}
.alert-cancle {
border: 1px solid #ccc;
}
.open {
margin: 20px;
height: 30px;
width: 50px;
}
.show {
visibility: visible;
opacity: 1;
}
.show .alert-content {
transform: scale(1);
}
</style>
<body>
<button class="open" onclick="openAlert()"> 打开 </button>
<div class="alert-box" id="alertBox">
<div class="alert-content">
<div class="alert-title">提示</div>
<div class="alert-info">提示框的内容</div>
<div class="alert-buttons">
<div class="alert-cancle" onclick="hiddenAlert()">取消</div>
<div class="alert-submit" onclick="hiddenAlert()">确定</div>
</div>
</div>
</div>
</body>
<script>
function openAlert() {
document.getElementById("alertBox").classList.add(‘show‘)
}
function hiddenAlert() {
document.getElementById("alertBox").classList.remove(‘show‘)
}
</script>
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