规范引入了一个新的filter()函数，你可以像下面这样使用背景图像:

background: filter(url("whatever.jpg"), blur(5px));

<filter()>函数有两个参数。第一个参数是<image>。第二个是为CSS filter属性指定的筛选器函数列表。该函数接受参数并应用筛选规则，返回一个处理图像。

但是浏览器不支持这个:https://caniuse.com/css-filter-function。目前只能在Safari上进行测试。

下面是一个简单的解决方案，适用于现代浏览器，使用纯CSS和一个'before'伪元素，就像Matthew Wilcoxson的解决方案一样。

为了避免在JavaScript中需要访问伪元素来更改图像和其他属性，只需使用inherit作为值，并通过父元素(这里是body)访问它们。

body::before {
    content: ""; /* Important */
    z-index: -1; /* Important */
    position: inherit;
    left: inherit;
    top: inherit;
    width: inherit;
    height: inherit;
    background-image: inherit;
    background-size: cover;
    filter: blur(8px);
}

body {
  background-image: url("xyz.jpg");
  background-size: 0 0;  /* Image should not be drawn here */
  width: 100%;
  height: 100%;
  position: fixed; /* Or absolute for scrollable backgrounds */
}

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>

请检查以下代码:-

.backgroundImageCVR{ position:relative; padding:15px; } .background-image{ position:absolute; left:0; right:0; top:0; bottom:0; background:url('https://i.imgur.com/5SZI6qZ.jpeg'); background-size:cover; z-index:1; -webkit-filter: blur(10px); -moz-filter: blur(10px); -o-filter: blur(10px); -ms-filter: blur(10px); filter: blur(10px); } .content{ position:relative; z-index:2; color:#fff; } <div class="backgroundImageCVR"> <div class="background-image"></div> <div class="content"> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis aliquam erat in ante malesuada, facilisis semper nulla semper. Phasellus sapien neque, faucibus in malesuada quis, lacinia et libero. Sed sed turpis tellus. Etiam ac aliquam tortor, eleifend rhoncus metus. Ut turpis massa, sollicitudin sit amet molestie a, posuere sit amet nisl. Mauris tincidunt cursus posuere. Nam commodo libero quis lacus sodales, nec feugiat ante posuere. Donec pulvinar auctor commodo. Donec egestas diam ut mi adipiscing, quis lacinia mauris condimentum. Quisque quis odio venenatis, venenatis nisi a, vehicula ipsum. Etiam at nisl eu felis vulputate porta.</p> <p>Fusce ut placerat eros. Aliquam consequat in augue sed convallis. Donec orci urna, tincidunt vel dui at, elementum semper dolor. Donec tincidunt risus sed magna dictum, quis luctus metus volutpat. Donec accumsan et nunc vulputate accumsan. Vestibulum tempor, erat in mattis fringilla, elit urna ornare nunc, vel pretium elit sem quis orci. Vivamus condimentum dictum tempor. Nam at est ante. Sed lobortis et lorem in sagittis. In suscipit in est et vehicula.</p> </div> </div>

CSS网格对我来说更容易理解。：）

html, body { width: 100%; height: 100%; } .container { width: 100%; height: 100%; display: grid; grid-template-columns: 1fr 6fr 1fr; grid-template-rows: 1fr 6fr 1fr; grid-template-areas: '. . .' '. content .' '. . .'; justify-content: center; align-items: center; } .backbround { width: 100%; height: 100%; grid-area: 1/1/5/5; background-image: url(https://i.imgur.com/aUhpEz3.jpg); filter: blur(5px); background-position: center; background-repeat: no-repeat; background-size: cover; } .content { height: 200px; position: relative; grid-area: content; display: flex; justify-content: center; align-items: center; color: white; } <div class="container"> <div class="backbround"></div> <div class="content"><h1>Hello World</h1></div> </div>

成功应用背景图像的步骤

确保使用link标签正确链接了HTML和CSS <link rel="stylesheet" ref="yourcssdocument.css"> 我不知道相对目录和子目录，所以我不能评论它 对我来说，最好的方法是在css中使用URL链接

#yourcssdoc .image {
   background-image: url("paste your link here with the quotations")
}