官方给出的定义是：backdrop-filter属性允许您将图形效果（如模糊或颜色偏移）应用于元素后面的区域。因为它适用于元素后面的所有内容，所以要查看元素或其背景的效果，需要透明或部分透明。
大致分为以下10种：
backdrop-filter: blur(2px);
backdrop-filter: brightness(60%);
backdrop-filter: contrast(40%);
backdrop-filter: drop-shadow(4px 4px 10px blue);
backdrop-filter: grayscale(30%);
backdrop-filter: hue-rotate(120deg);
backdrop-filter: invert(70%);
backdrop-filter: opacity(20%);
backdrop-filter: sepia(90%);
backdrop-filter: saturate(80%);根据上述10种，做了一张汇总图
同样直接贴一下源码吧
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>backdrop-filter</title>
<style>
h3{
text-align: center;
}
.container {
display: flex;
justify-content: flex-start;
flex-wrap: wrap;
}
.box {
position: relative;
width: 20%;
height: 200px;
vertical-align: middle;
border: 5px solid #FFFFFF;
box-sizing: border-box;
background: url('img/bg.png') no-repeat top;
background-size: auto;
}
p {
margin: 100px auto;
color: #FFBB00;
font-weight: bold;
text-align: center;
padding: 10px 0;
background-color: transparent;
}
.box:nth-child(1) p {
backdrop-filter: blur(10px);
}
.box:nth-child(2) p {
backdrop-filter: brightness(60%);
}
.box:nth-child(3) p {
backdrop-filter: contrast(40%);
}
.box:nth-child(4) p {
backdrop-filter: drop-shadow(1px 1px 10px blue);
}
.box:nth-child(5) p {
backdrop-filter: grayscale(60%);
}
.box:nth-child(6) p {
backdrop-filter: hue-rotate(120deg);
}
.box:nth-child(7) p {
backdrop-filter: invert(70%);
}
.box:nth-child(8) p {
backdrop-filter: opacity(10%);
}
.box:nth-child(9) p {
backdrop-filter: sepia(90%);
}
.box:nth-child(10) p {
backdrop-filter: saturate(20%);
}
</style>
</head>
<body>
<h3>backdrop-filter属性各类值的效果</h3>
<div class="container">
<div class="box">
<p>模糊<br/>backdrop-filter: blur(10px)</p>
</div>
<div class="box">
<p>亮度<br/>backdrop-filter: brightness(60%)</p>
</div>
<div class="box">
<p>对比度<br/>backdrop-filter: contrast(40%)</p>
</div>
<div class="box">
<p>下降阴影<br/>backdrop-filter: drop-shadow(4px 4px 100px blue)</p>
</div>
<div class="box">
<p>灰度<br/>backdrop-filter: grayscale(60%)</p>
</div>
<div class="box">
<p>色调旋转<br/>backdrop-filter: hue-rotate(120deg)</p>
</div>
<div class="box">
<p>反转<br/>backdrop-filter: invert(70%)</p>
</div>
<div class="box">
<p>不透明度<br/>backdrop-filter: opacity(20%)</p>
</div>
<div class="box">
<p>深褐色<br/>backdrop-filter: sepia(90%)</p>
</div>
<div class="box">
<p>饱和<br/>backdrop-filter: saturate(20%)</p>
</div>
</div>
</body>
</html>
