filter 属性定义了元素(通常是<img>,也可是文字块,整块)的可视效果(例如:模糊与饱和度)。
filter: none | blur(px) | brightness(%) | contrast(%) | drop-shadow(h-shadow v-shadow blur spread color) | grayscale(%) | hue-rotate(%) | invert(%) | opacity(%) | saturate(%) | sepia(%) | url(%);
原图:
![](https://img.haomeiwen.com/i13305332/0e53276b70a26126.png)
设置模糊度 filter: blur(5px)
![](https://img.haomeiwen.com/i13305332/b86266bb838a2a66.png)
设置饱和度(更亮和更暗) filter: brightness(80%);
![](https://img.haomeiwen.com/i13305332/0b83639dde28f7a5.png)
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