我有一个JPEG文件，我使用作为搜索页面的背景图像，我使用CSS来设置它，因为我在Backbone.js上下文中工作:
background-image: url("whatever.jpg");
我想应用css3模糊过滤器只对背景，但我不确定如何样式只是一个元素。如果我试着:
-webkit-filter: blur(5px);
-moz-filter: blur(5px);
-o-filter: blur(5px);
-ms-filter: blur(5px);
filter: blur(5px);
就在我的CSS中的background-image下面，它为整个页面设置了样式，而不仅仅是背景。是否有一种方法只选择图像并应用过滤器?或者，有没有一种方法可以关闭页面上所有其他元素的模糊效果?
当前回答
当然，这不是css解决方案，但你可以使用CDN质子过滤器:
body {
background: url('https://i0.wp.com/IMAGEURL?w=600&filter=blurgaussian&smooth=1');
}
它来自https://developer.wordpress.com/docs/photon/api/#filter
其他回答
在CSS的.content选项卡中将其更改为position:absolute。否则，渲染的页面将不可滚动。
你所需要的只是“filter”:
blur(«WhatEverYouWantInPixels»);"
body { color: #fff; font-family: Helvetica, Arial, sans-serif; } #background { background-image: url('https://cdn2.geckoandfly.com/wp-content/uploads/2018/03/ios-11-3840x2160-4k-5k-beach-ocean-13655.jpg'); background-repeat: no-repeat; background-size: cover; width: 100vw; height: 100vh; overflow: hidden; position: absolute; top: 0; left: 0; z-index: -1; /* START */ /* START */ /* START */ /* START */ /* You can adjust the blur-radius as you'd like */ filter: blur(3px); } <div id="background"></div> <p id="randomContent">Lorem Ipsum</p>
我没有写这个，但是我注意到使用CSS SASS编译器有一个部分支持的后台过滤器的polyfill，所以如果你有一个编译管道，它可以很好地实现(它也使用TypeScript):
https://codepen.io/mixal_bl4/pen/EwPMWo
pen
取消了对额外元素的需求，同时使内容适合文档流，而不是像其他解决方案那样固定/绝对。
通过使用
.content { /* this is needed or the background will be offset by a few pixels at the top */ overflow: auto; position: relative; } .content::before { content: ""; position: fixed; left: 0; right: 0; z-index: -1; display: block; background-image: url('https://i.imgur.com/lL6tQfy.png'); background-size:cover; width: 100%; height: 100%; -webkit-filter: blur(5px); -moz-filter: blur(5px); -o-filter: blur(5px); -ms-filter: blur(5px); filter: blur(5px); } <div class="content"> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. </div>
编辑如果你想删除边缘的白色边框，使用宽度和高度为110%，左侧和顶部为-5%。这将放大你的背景-但不应该有纯色从边缘流出。感谢Chad Fawcett的建议。
.content { /* this is needed or the background will be offset by a few pixels at the top */ overflow: auto; position: relative; } .content::before { content: ""; position: fixed; top: -5%; left: -5%; right: -5%; z-index: -1; display: block; background-image: url('https://i.imgur.com/lL6tQfy.png'); background-size:cover; width: 110%; height: 110%; -webkit-filter: blur(5px); -moz-filter: blur(5px); -o-filter: blur(5px); -ms-filter: blur(5px); filter: blur(5px); } <div class="content"> Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. </div>
<!-- Q:Create the blur on parenttal div without effecting the child div -->
<!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>
</head>
<style>
*{
margin: 0; padding: 0; box-sizing: border-box;
font-size: 30px;
}
.parent{
background-image:url(hobby.jpg) ;
height: 100vh;
width: 100vw;
background-repeat: no-repeat;
background-size: cover;
background-position: center;
display: flex;
justify-content: center;
align-items: center;
}
.child{
height: 90vh;
width: 90vw;
backdrop-filter: blur(10px);
border: 1px solid rgba(0, 0, 0, 0.418);
justify-content: center;
align-items: center;
display: flex;
}
.text{
height: 300px;
width: 300px;
border-radius: 500px;
background-image: url(50cf380e5c78eb174faa8e6ac2cb654a.jpg);
background-size: cover;
background-position: center;
}
</style>
<body>
<div class="parent">
<div class="child">
<div class="text"></div>
</div>
</div>
</body>
</html>
