如何将颜色在RGB格式转换为十六进制格式,反之亦然?
例如,将'#0080C0'转换为(0,128,192)。
如何将颜色在RGB格式转换为十六进制格式,反之亦然?
例如,将'#0080C0'转换为(0,128,192)。
当前回答
2021年版
你可以简单地使用rgb-十六进制和十六进制-rgb,因为它是经过战斗测试的,有多个选项,在其他解决方案中是不可用的。
我最近正在构建一个颜色选择器&这2个包派上用场。
使用
rgb-hex
import rgbHex from 'rgb-hex';
rgbHex(65, 131, 196);
//=> '4183c4'
rgbHex('rgb(40, 42, 54)');
//=> '282a36'
rgbHex(65, 131, 196, 0.2);
//=> '4183c433'
rgbHex(40, 42, 54, '75%');
//=> '282a36bf'
rgbHex('rgba(40, 42, 54, 75%)');
//=> '282a36bf'
hex-rgb
import hexRgb from 'hex-rgb';
hexRgb('4183c4');
//=> {red: 65, green: 131, blue: 196, alpha: 1}
hexRgb('#4183c4');
//=> {red: 65, green: 131, blue: 196, alpha: 1}
hexRgb('#fff');
//=> {red: 255, green: 255, blue: 255, alpha: 1}
hexRgb('#22222299');
//=> {red: 34, green: 34, blue: 34, alpha: 0.6}
hexRgb('#0006');
//=> {red: 0, green: 0, blue: 0, alpha: 0.4}
hexRgb('#cd2222cc');
//=> {red: 205, green: 34, blue: 34, alpha: 0.8}
hexRgb('#cd2222cc', {format: 'array'});
//=> [205, 34, 34, 0.8]
hexRgb('#cd2222cc', {format: 'css'});
//=> 'rgb(205 34 34 / 80%)'
hexRgb('#000', {format: 'css'});
//=> 'rgb(0 0 0)'
hexRgb('#22222299', {alpha: 1});
//=> {red: 34, green: 34, blue: 34, alpha: 1}
hexRgb('#fff', {alpha: 0.5});
//=> {red: 255, green: 255, blue: 255, alpha: 0.5}
其他回答
以下是我的看法:
function rgbToHex(red, green, blue) {
const rgb = (red << 16) | (green << 8) | (blue << 0);
return '#' + (0x1000000 + rgb).toString(16).slice(1);
}
function hexToRgb(hex) {
const normal = hex.match(/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i);
if (normal) return normal.slice(1).map(e => parseInt(e, 16));
const shorthand = hex.match(/^#([0-9a-f])([0-9a-f])([0-9a-f])$/i);
if (shorthand) return shorthand.slice(1).map(e => 0x11 * parseInt(e, 16));
return null;
}
结合使用匿名函数和数组。地图为清洁工;更流线型的外观。
var write=function(str){document.body.innerHTML=JSON.stringify(str,null,' ');}; function hexToRgb(hex, asObj) { return (function(res) { return res == null ? null : (function(parts) { return !asObj ? parts : { r : parts[0], g : parts[1], b : parts[2] } }(res.slice(1,4).map(function(val) { return parseInt(val, 16); }))); }(/^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex))); } function rgbToHex(r, g, b) { return (function(values) { return '#' + values.map(function(intVal) { return (function(hexVal) { return hexVal.length == 1 ? "0" + hexVal : hexVal; }(intVal.toString(16))); }).join(''); }(arguments.length === 1 ? Array.isArray(r) ? r : [r.r, r.g, r.b] : [r, g, b])) } // Prints: { r: 255, g: 127, b: 92 } write(hexToRgb(rgbToHex(hexToRgb(rgbToHex(255, 127, 92), true)), true)); body{font-family:monospace;white-space:pre}
从HEX转换为RGB,其中RGB是0到1范围内的浮点值:
#FFAA22→{r: 0.5, g: 0, b:1}
我改编了@Tim Down的回答:
function convertRange(value,oldMin,oldMax,newMin,newMax) {
return (Math.round(((((value - oldMin) * (newMax - newMin)) / (oldMax - oldMin)) + newMin) * 10000)/10000)
}
function hexToRgbFloat(hex) {
var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return result ? {
r: convertRange(parseInt(result[1],16), 0, 255, 0, 1),
g: convertRange(parseInt(result[2],16), 0, 255, 0, 1),
b: convertRange(parseInt(result[3],16), 0, 255, 0, 1)
} : null;
}
console.log(hexToRgbFloat("#FFAA22")) // {r: 1, g: 0.6667, b: 0.1333}
我遇到了这个问题,因为我想要解析任何颜色字符串值,并能够指定不透明度,所以我写了这个使用canvas API的函数。
var toRGBA = function () {
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
canvas.width = 1;
canvas.height = 1;
return function (color) {
context.fillStyle = color;
context.fillRect(0, 0, 1, 1);
var data = context.getImageData(0, 0, 1, 1).data;
return {
r: data[0],
g: data[1],
b: data[2],
a: data[3]
};
};
}();
关于context.fillStyle注意:
如果解析值导致失败,则必须忽略该值,属性必须保留其先前的值。
下面是一个你可以用来测试输入的Stack Snippet演示:
var toRGBA = function () { var canvas = document.createElement('canvas'); var context = canvas.getContext('2d'); canvas.width = 1; canvas.height = 1; return function (color) { context.fillStyle = color; context.fillRect(0, 0, 1, 1); var data = context.getImageData(0, 0, 1, 1).data; return { r: data[0], g: data[1], b: data[2], a: data[3] }; }; }(); var inputs = document.getElementsByTagName('input'); function setColor() { inputs[1].value = JSON.stringify(toRGBA(inputs[0].value)); document.body.style.backgroundColor = inputs[0].value; } inputs[0].addEventListener('input', setColor); setColor(); input { width: 200px; margin: 0.5rem; } <input value="cyan" /> <input readonly="readonly" />
My example =) color: { toHex: function(num){ var str = num.toString(16); return (str.length<6?'#00'+str:'#'+str); }, toNum: function(hex){ return parseInt(hex.replace('#',''), 16); }, rgbToHex: function(color) { color = color.replace(/\s/g,""); var aRGB = color.match(/^rgb\((\d{1,3}[%]?),(\d{1,3}[%]?),(\d{1,3}[%]?)\)$/i); if(aRGB) { color = ''; for (var i=1; i<=3; i++) color += Math.round((aRGB[i][aRGB[i].length-1]=="%"?2.55:1)*parseInt(aRGB[i])).toString(16).replace(/^(.)$/,'0$1'); } else color = color.replace(/^#?([\da-f])([\da-f])([\da-f])$/i, '$1$1$2$2$3$3'); return '#'+color; }