7个关于 CSS backgroundImage 好用的技巧

悠悠 2023-02-09 14:28 57阅读 0赞

## 1.背景图如何才能完美适配视口 ##

让背景图适配视口很容易，需要使用下面 CSS 即可：

body {
      background-image: url('https://images.unsplash.com/photo-1573480813647-552e9b7b5394?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2253&q=80');
      background-repeat: no-repeat;
      background-position: center;
      background-attachment: fixed;
      background-size: cover;
      -webkit-background-size: cover;
      -moz-background-size: cover;
      -o-background-size: cover;
    }

![clipboard.png][]

事例源码：[https://codepen.io/duomly/pen...][https_codepen.io_duomly_pen...]点击预览

## 2.如何在CSS中使用多个背景图片？ ##

如果我想在背景中添加一张以上的图片怎么办？CSS3 中可以直接 指定多个背景路径，如下所示：

body {
      background-image: url(https://image.flaticon.com/icons/svg/748/748122.svg), url(https://images.unsplash.com/photo-1478719059408-592965723cbc?ixlib=rb-1.2.1&auto=format&fit=crop&w=2212&q=80);
      background-position: center, top;
      background-repeat: repeat, no-repeat;
      background-size: contain, cover;
    }

![clipboard.png][clipboard.png 1]

事例源码：[https://codepen.io/duomly/pen...][https_codepen.io_duomly_pen... 1]点击预览

## 3.如何创建一个三角形的背景图像 ##

另一个很酷的背景特效就是三角形背景，当我们想展示某些完全不同的选择（例如白天和黑夜或冬天和夏天）时，这种特效就更加棒。

思路是这样的，首先创建两个`div`，然后将两个背景都添加到其中，然后，第二个`div`使用`clip-path`属性画出三角形。

![clipboard.png][clipboard.png 2]

**html**

**css**

body {
      margin: 0;
      padding: 0;
    }
    
    div {
      position: absolute;
      height: 100vh;
      width: 100vw;
    }
    
    .day {
      background-image: url("https://images.unsplash.com/photo-1477959858617-67f85cf4f1df?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2613&q=80");
      background-size: cover;
      background-repeat: no-repeat;
    }
    
    .night {
      background-image: url("https://images.unsplash.com/photo-1493540447904-49763eecf55f?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      background-size: cover;
      background-repeat: no-repeat;
      clip-path: polygon(100vw 0, 0% 0vh, 100vw 100vh);
    }

源码：[https://codepen.io/duomly/pen...][https_codepen.io_duomly_pen... 2]点击预览

## 4.如何在背景图像上添加叠加渐变？ ##

有时我们想在背景上添加一些文字，但有的图片太亮，导致字看不清楚，所以这里我们就需要让背景图叠加一些暗乐来突出文字效果。

例如，可以通过添加粉红橙色渐变或红色至透明渐变来增强日落图像，这些情况下使用叠加的渐变就很容易做到。

![clipboard.png][clipboard.png 3]

**css**

body {
      background-image: 
        linear-gradient(4deg, rgba(38,8,31,0.75) 30%, rgba(213,49,127,0.3) 45%, rgba(232,120,12,0.3) 100%),
        url("https://images.unsplash.com/photo-1503803548695-c2a7b4a5b875?ixlib=rb-1.2.1&auto=format&fit=crop&w=2250&q=80");
      background-size: cover;
      background-repeat: no-repeat;
      background-attachment: fixed;
      background-position: center
    }

源码：[https://codepen.io/duomly/pen...][https_codepen.io_duomly_pen... 3]点击预览

## 5.如何创建一个颜色动态变化的背景 ##

如果你很多颜色，你想确认哪种颜色更适合背景图片的颜色，刚动态更改背景颜色的技巧就很有用。

**css**

HTML CSSResult
    EDIT ON
    @keyframes background-overlay-animation {
      0%   {
          background-image: 
            linear-gradient(4deg, rgba(255,78,36,0.3) 50%, rgba(255,78,36,0.3) 100%), url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      }
      25%  {
          background-image: 
             linear-gradient(4deg, rgba(213,49,127,0.3) 50%, rgba(213,49,127,0.3) 100%), url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      }
      50%  {
        background-image: 
           linear-gradient(4deg, rgba(36,182,255,0.3) 50%, rgba(36,182,255,1) 100%),
         url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      }
      100% {
        background-image: 
            linear-gradient(4deg, rgba(0,255,254,0.3) 50%, rgba(0,255,254,0.3) 100%),
            url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      }
    }
    
    @-webkit-keyframes background-overlay-animation {
      0%   {
          background-image: 
            linear-gradient(4deg, rgba(255,78,36,0.3) 50%, rgba(255,78,36,0.3) 100%)
            url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      }
      25%  {
          background-image: 
             linear-gradient(4deg, rgba(213,49,127,0.3) 50%, rgba(213,49,127,0.3) 100%),
            url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      }
      50%  {
        background-image: 
           linear-gradient(4deg, rgba(36,182,255,0.3) 50%, rgba(36,182,255,1) 100%),
         url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
      }
      100% {
        background-image: 
            linear-gradient(4deg, rgba(0,255,254,0.3) 50%, rgba(0,255,254,0.3) 100%),

![图片描述][format_png]

源码：[https://codepen.io/duomly/pen...][https_codepen.io_duomly_pen... 4]点击预览

**大家都说简历没项目写，我就帮大家找了一个项目，还附赠[【搭建教程】][Link 1]。**

## 6. 如何制作网格背景图像？ ##

有时候会遇到一些需要有艺术或者摄影类的项目，他们一般要求网站要有艺术信息，要有创意。网络的背景就挺有创意的，效果如下:

![clipboard.png][clipboard.png 4]

**HTML**

**scss**

body {
     margin: 0;
      padding: 0;
    }
    
    .container {
      position: absolute;
      width: 100%;
      height: 100%;
      background: black;
      display: grid;
      grid-template-columns: 25fr 30fr 40fr 15fr;
      grid-template-rows: 20fr 45fr 5fr 30fr;
      grid-gap: 20px;
      .item_img {
        background-image: url('https://images.unsplash.com/photo-1499856871958-5b9627545d1a?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2207&q=80');
      background-repeat: no-repeat;
      background-position: center;
      background-attachment: fixed;
      background-size: cover;
    }
    }

源码：[https://codepen.io/duomly/pen...][https_codepen.io_duomly_pen... 5]点击预览

## 7.如何将背景图像设置为文本颜色？ ##

使用`background-image`与` background-clip `，可以实现背景图像对文字的优美效果。 在某些情况下，它可能非常有用，尤其是当我们想创建一个较大的文本标题而又不如普通颜色那么枯燥的情况。

![图片描述][format_png 1]

**HTML**

<body>
      <h1>Hello world!</h1>
    </body>

**SCSS**

body {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-direction: column;
      width: 100%;
      text-align: center;
      min-height: 100vh;
      font-size: 120px;
      font-family:Arial, Helvetica, sans-serif;
    }
    
    h1 {
       background-image: url("https://images.unsplash.com/photo-1462275646964-a0e3386b89fa?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2600&q=80");
      background-clip: text;
      -webkit-background-clip: text;
      color: transparent;
    }

源码：[https://codepen.io/duomly/pen...][https_codepen.io_duomly_pen... 6]点击预览

[clipboard.png]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zZWdtZW50ZmF1bHQuY29tL2ltZy9iVmJIaHVP?x-oss-process=image/format,png
[https_codepen.io_duomly_pen...]: https://codepen.io/duomly/pen/xxwYBOE
[clipboard.png 1]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zZWdtZW50ZmF1bHQuY29tL2ltZy9iVmJHOVYy?x-oss-process=image/format,png
[https_codepen.io_duomly_pen... 1]: https://codepen.io/duomly/pen/eYpVoJR
[clipboard.png 2]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zZWdtZW50ZmF1bHQuY29tL2ltZy9iVmJIaHNw?x-oss-process=image/format,png
[https_codepen.io_duomly_pen... 2]: https://codepen.io/duomly/pen/RwWQmwW
[clipboard.png 3]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zZWdtZW50ZmF1bHQuY29tL2ltZy9iVmJIaHRN?x-oss-process=image/format,png
[https_codepen.io_duomly_pen... 3]: https://codepen.io/duomly/pen/rNOJgQE
[format_png]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zZWdtZW50ZmF1bHQuY29tL2ltZy9iVmJIaHRZ?x-oss-process=image/format,png
[https_codepen.io_duomly_pen... 4]: https://codepen.io/duomly/pen/gOavNOv
[Link 1]: https://github.com/qq449245884/xiaozhi/issues/210
[clipboard.png 4]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zZWdtZW50ZmF1bHQuY29tL2ltZy9iVmJIaHVt?x-oss-process=image/format,png
[https_codepen.io_duomly_pen... 5]: https://codepen.io/duomly/pen/MWaQNWb
[format_png 1]: https://imgconvert.csdnimg.cn/aHR0cHM6Ly9zZWdtZW50ZmF1bHQuY29tL2ltZy9iVmJIaHV6?x-oss-process=image/format,png
[https_codepen.io_duomly_pen... 6]: https://codepen.io/duomly/pen/wvKyVjG