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css-luma.html
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<!DOCTYPE html>
<html lang="en">
<header>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta
name="viewport"
content="width=device-width,initial-scale=1.0,min-scale=1.0,max-scale=1.0"
/>
<title>CSS如何根据背景色深浅切换文字颜色？</title>
<style>
.bgaa {
height: 100px;
line-height: 100px;
text-align: center;
background-color: black;
color: #fff;
}
.bgbox {
height: 100px;
line-height: 100px;
color: blue;
background-color: currentColor;
}
.bgbox > .bgbox-text {
text-align: center;
filter: grayscale(1) contrast(999) invert(1);
}
:root {
--red: 44;
--green: 135;
--blue: 255;
--threshold: 0.5;
--border-threshold: 0.8;
}
.bgbox-css-calc {
height: 100px;
line-height: 100px;
text-align: center;
background-color: rgb(var(--red), var(--green), var(--blue));
--r: calc(var(--red) * 0.2126);
--g: calc(var(--green) * 0.7152);
--b: calc(var(--blue) * 0.0722);
--sum: calc(var(--r) + var(--g) + var(--b));
--lightness: calc(var(--sum) / 255);
color: hsl(
0,
0%,
calc((var(--lightness) - var(--threshold)) * -999999%)
);
--border-alpha: calc((var(--lightness) - var(--threshold)) * 100);
border: 0.2em solid;
border-color: rgba(
calc(var(--red) - 50),
calc(var(--green) - 50),
calc(var(--blue) - 50),
var(--border-alpha)
);
}
.bgbox-num,
.bgbox-num1 {
display: flex;
flex-direction: row;
}
num {
width: 200px;
text-align: center;
font-size: 26px;
/* color: #aaa; */
--s: clamp(0%, (var(--num) - 99) * 99%, 85%);
color: hsl(27 var(--s) 36%);
}
num::before,
num1::before,
num2::before {
counter-reset: num var(--num);
content: counter(num);
/* display: block; */
}
num::after,
num1::after,
num2::after {
content: "阅读";
font-weight: bold;
}
num1 {
width: 200px;
text-align: center;
font-size: 26px;
/* 30 128 255 -> 245 63 63 */
--r: clamp(30, (var(--num) - 99) * 999 + 30, 245);
--g: clamp(63, (var(--num) - 100) * -999 + 63, 128);
--b: clamp(63, (var(--num) - 100) * -999 + 63, 255);
color: rgb(var(--r), var(--g), var(--b));
}
num2 {
width: 200px;
text-align: center;
font-size: 26px;
background: linear-gradient(rgb(244 67 54), rgb(244 67 54)),
linear-gradient(rgb(29 125 250), rgb(29 125 250));
color: transparent;
background-size: calc((var(--num) - 99) * 100%), 100%;
-webkit-background-clip: text;
background-clip: text;
}
.bar {
display: flex;
background-color: #a0a0a0;
}
.bar::before {
counter-reset: percent-bar var(--percent);
content: counter(percent-bar) "%\2002";
white-space: nowrap;
display: flex;
justify-content: end;
width: calc(var(--percent) * 1%);
background: linear-gradient(red, red), linear-gradient(orange, orange),
linear-gradient(yellow, yellow), linear-gradient(green, green);
color: #fff;
background-size: calc((var(--percent) - 90) * 100%) 100%,
calc((var(--percent) - 60) * 100%) 100%,
calc((var(--percent) - 30) * 100%) 100%, 100% 100%;
--offset: clamp(0%, (var(--percent) - 10) * -120%, 120%);
text-indent: var(--offset);
--lightness: clamp(35%, (var(--percent) - 10) * 999%, 100%);
color: hsl(0, 100%, var(--lightness));
}
</style>
</header>
<body>
<div class="bgaa">啊啊啊啊啊</div>
<div class="bgbox">
<div class="bgbox-text">css滤镜 - 只适用于黑白变化</div>
</div>
<div class="bgbox-css-calc">css计算属性组合</div>
<div class="bgbox-num">
<h3>灰色 -> 自定义颜色 clamp</h3>
<num style="--num: 1"></num>
<num style="--num: 99"></num>
<num style="--num: 120"></num>
</div>
<div class="bgbox-num1">
<h3>绝对颜色控制：自定义颜色 -> 自定义颜色 clamp</h3>
<num1 style="--num: 1"></num1>
<num1 style="--num: 99"></num1>
<num1 style="--num: 120"></num1>
</div>
<num2 style="--num: 100"></num2>
<div class="bar" style="--percent: 50"></div>
<script>
let _div = document.querySelector(".bgaa");
let r = 24,
g = 24,
b = 24;
let luma = (r * 0.2126 + g * 0.7152 + b * 0.0722) / 255;
_div.style.backgroundColor = `rgba(${r},${g},${b},1)`;
_div.style.color = luma >= 0.5 ? "#000" : "#fff";
</script>
</body>
</html>