GitHub热门前端练手项目&＃xff0c;纯HTML、CSS、JS实现&＃xff0c;50天50个项目&＃xff0c;每日一个项目&＃xff0c;打卡活动&＃xff0c;解读项目中的知识点
GitHub项目官网连接
50Projects in 50 Days
项目展示
实现一个模糊加载的效果&＃xff0c;当加载到100%时&＃xff0c;图片清晰度正常
源码
HTML
DOCTYPE html>
<html lang&＃61;"en">
<head>
<meta charset&＃61;"UTF-8" />
<meta name&＃61;"viewport" content&＃61;"width&＃61;device-width, initial-scale&＃61;1.0" />
<link rel&＃61;"stylesheet" href&＃61;"style.css" />
<title>Blurry Loadingtitle>
head>
<body>
<section class&＃61;"bg">section>
<div class&＃61;"loading-text">0%div>
<script src&＃61;"script.js">script>
body>
html>
CSS
&＃64;import url(&＃39;https://fonts.googleapis.com/css?family&＃61;Ubuntu&＃39;);
* {
box-sizing: border-box;
}
body {
font-family: &＃39;Ubuntu&＃39;, sans-serif;
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
overflow: hidden;
margin: 0;
}
.bg {
background: url(&＃39;https://images.unsplash.com/photo-1576161787924-01bb08dad4a4?ixlib&＃61;rb-1.2.1&ixid&＃61;eyJhcHBfaWQiOjEyMDd9&auto&＃61;format&fit&＃61;crop&w&＃61;2104&q&＃61;80&＃39;) no-repeat center center/cover;
position: absolute;
top: -30px;
left: -30px;
width: calc(100vw &＃43; 60px);
height: calc(100vh &＃43; 60px);
z-index: -1;
filter: blur(0px);
}
.loading-text {
font-size: 50px;
color: #fff;
}
JS
const loadText &＃61; document.querySelector(&＃39;.loading-text&＃39;)
const bg &＃61; document.querySelector(&＃39;.bg&＃39;)
let load &＃61; 0
let int &＃61; setInterval(blurring, 30)
function blurring() {
load&＃43;&＃43;
if (load > 99) {
clearInterval(int)
}
loadText.innerText &＃61; &＃96;${load}%&＃96;
loadText.style.opacity &＃61; scale(load, 0, 100, 1, 0)
bg.style.filter &＃61; &＃96;blur(${scale(load, 0, 100, 30, 0)}px)&＃96;
}
const scale &＃61; (num, in_min, in_max, out_min, out_max) &＃61;> {
return ((num - in_min) * (out_max - out_min)) / (in_max - in_min) &＃43; out_min
}
知识点总结
CSS部分
CSS滤镜
CSS 中实现滤镜效果需要通过 filter 属性并配合一些函数来实现
https://www.runoob.com/cssref/css3-pr-filter.html
filter属性可以为元素添加滤镜效果&＃xff0c;例如图像、文字等
<img src&＃61;"../background-slider/IMG_20210603_191954.jpg" alt&＃61;"">
<style>
img {
width: 50%;
height: 50%;
filter: blur(10px);
}
style>
函数还有&＃xff1a;
-
blur(px)设置高斯模糊&＃xff0c;数值越大越模糊
-
brightness(%)调整图片亮度&＃xff0c;0%&＃xff0c;图像全黑&＃xff0c;100%图像无变化&＃xff0c;超过100%会更亮
-
contrast(%)&＃xff0c;调整图像的对比度&＃xff0c;值是0%&＃xff0c;图像全灰&＃xff0c;100%图像不变&＃xff0c;超过100%&＃xff0c;对比度更高
-
saturate(%)&＃xff0c;转换图像饱和度&＃xff0c;0%完全不饱和&＃xff0c;100%图像无变化&＃xff0c;超过100%饱和度增大
-
grayscale(%)&＃xff0c;转换为灰度图像&＃xff0c;0%图像无变化&＃xff0c;100%图像完全灰色
-
drop-shadow(x,y,blur,color)&＃xff0c;给图像设置一个阴影效果&＃xff0c;阴影是合成在图像下面&＃xff0c;指定阴影的位置(x,y)&＃xff0c;阴影的模糊程度blur()&＃xff0c;阴影的扩展范围spread&＃xff0c;阴影的颜色color
filter: drop-shadow(30px 10px 4px #4444dd);
滤镜是支持叠加的&＃xff0c;使用多个滤镜&＃xff0c;给图像带来不一样的效果
filter: drop-shadow(20px 10px 5px rgb(53, 153, 56)) contrast(150%) blur(10px)
补充&＃xff1a; 如果body设置了背景图片&＃xff0c;那么对于body的filter就不会生效
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