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; }

试(奖金)

let hex2rgb= c=> `rgb(${c.match(/\w\w/g).map(x=>+`0x${x}`)})`
let rgb2hex=c=>'#'+c.match(/\d+/g).map(x=>(+x).toString(16).padStart(2,0)).join``

让hex2rgb = c = > ' rgb ($ {c.match (w / \ \ w / g) . map (x = > + 0 x $ {x})})”; 让rgb2hex = c = > ' # ' + c.match (\ d + / g) . map (x = > (+ x) .toString (16) .padStart (2,0)) . join '; / /测试 console.log('#0080C0—>'，hex2rgb('#0080C0')); console.log(“rgb(0, 128, 192)——>”,rgb2hex(的rgb (0, 128, 192)));

function getRGB(color){
  if(color.length == 7){
    var r = parseInt(color.substr(1,2),16);
    var g = parseInt(color.substr(3,2),16);
    var b = parseInt(color.substr(5,2),16);    
    return 'rgb('+r+','+g+','+b+')' ;
  }    
  else
    console.log('Enter correct value');
}
var a = getRGB('#f0f0f0');
if(!a){
 a = 'Enter correct value'; 
}

a;

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}

基于@ michazperzhaakowski的回答(EcmaScipt 6)和他基于Tim Down的回答的回答

我写了一个转换hexToRGB函数的修改版本，增加了安全检查r/g/b颜色组件是否在0-255之间，而且函数可以接受数字r/g/b参数或字符串r/g/b参数，如下所示:

 function rgbToHex(r, g, b) {
     r = Math.abs(r);
     g = Math.abs(g);
     b = Math.abs(b);

     if ( r < 0 ) r = 0;
     if ( g < 0 ) g = 0;
     if ( b < 0 ) b = 0;

     if ( r > 255 ) r = 255;
     if ( g > 255 ) g = 255;
     if ( b > 255 ) b = 255;

    return '#' + [r, g, b].map(x => {
      const hex = x.toString(16);
      return hex.length === 1 ? '0' + hex : hex
    }).join('');
  }

为了安全地使用这个函数——你应该检查传递的字符串是否是真正的rbg字符串颜色——例如，一个非常简单的检查可以是:

if( rgbStr.substring(0,3) === 'rgb' ) {

  let rgbColors = JSON.parse(rgbStr.replace('rgb(', '[').replace(')', ']'))
  rgbStr = this.rgbToHex(rgbColors[0], rgbColors[1], rgbColors[2]);

  .....
}

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}