我意识到这个问题有很多答案，但如果你像我一样，你知道你的HEX总是6个字符，带或不带#前缀，那么如果你想做一些快速内联的东西，这可能是最简单的方法。它不关心是否以散列开始。

var hex = "#ffffff";
var rgb = [
    parseInt(hex.substr(-6,2),16),
    parseInt(hex.substr(-4,2),16),
    parseInt(hex.substr(-2),16)
];

hexToRgb的另一个版本:

function hexToRgb(hex) {
    var bigint = parseInt(hex, 16);
    var r = (bigint >> 16) & 255;
    var g = (bigint >> 8) & 255;
    var b = bigint & 255;

    return r + "," + g + "," + b;
}

编辑:3/28/2017 这是另一种似乎更快的方法

function hexToRgbNew(hex) {
  var arrBuff = new ArrayBuffer(4);
  var vw = new DataView(arrBuff);
  vw.setUint32(0,parseInt(hex, 16),false);
  var arrByte = new Uint8Array(arrBuff);

  return arrByte[1] + "," + arrByte[2] + "," + arrByte[3];
}

编辑:8/11/2017 经过更多测试后，上面的新方法并没有更快:(。虽然这是一种有趣的替代方式。

如果你需要比较两个颜色值(给定为RGB，名称颜色或十六进制值)或转换为hex使用HTML5 canvas对象。

var canvas = document.createElement("canvas");
var ctx = this.canvas.getContext('2d');

ctx.fillStyle = "rgb(pass,some,value)";
var temp =  ctx.fillStyle;
ctx.fillStyle = "someColor";

alert(ctx.fillStyle == temp);

一行功能HEX到RGBA

支持短#fff和长#ffffff格式。 支持alpha通道(不透明)。 不关心是否指定散列，在两种情况下都可以工作。

function hexToRGBA(hex, opacity) {
    return 'rgba(' + (hex = hex.replace('#', '')).match(new RegExp('(.{' + hex.length/3 + '})', 'g')).map(function(l) { return parseInt(hex.length%2 ? l+l : l, 16) }).concat(isFinite(opacity) ? opacity : 1).join(',') + ')';
}

例子:

hexToRGBA('#fff')        ->  rgba(255,255,255,1)  
hexToRGBA('#ffffff')     ->  rgba(255,255,255,1)  
hexToRGBA('#fff', .2)    ->  rgba(255,255,255,0.2)  
hexToRGBA('#ffffff', .2) ->  rgba(255,255,255,0.2)  
hexToRGBA('fff', .2)     ->  rgba(255,255,255,0.2)  
hexToRGBA('ffffff', .2)  ->  rgba(255,255,255,0.2)

hexToRGBA('#ffffff', 0)  ->  rgba(255,255,255,0)
hexToRGBA('#ffffff', .5) ->  rgba(255,255,255,0.5)
hexToRGBA('#ffffff', 1)  ->  rgba(255,255,255,1)

当你在3D环境中工作时(webGL, ThreeJS)，你有时需要为网格的不同面创建3个值，基本的一个(主色)，一个浅一点的和一个深一点的:

material.color.set( 0x660000, 0xff0000, 0xff6666 ); // red cube

我们可以从主RBG颜色创建这3个值:255,0,0

function rgbToHex(rgb) { 
  var hex = Number(rgb).toString(16);
  if (hex.length < 2) {
       hex = "0" + hex;
  }
  return hex;
};

function convertToHex(r,g,b) { 

    var fact = 100;  // contrast 
    var code = '0x';

    // main color
    var r_hexa = rgbToHex(r);
    var g_hexa = rgbToHex(g);
    var b_hexa = rgbToHex(b);

    // lighter
    var r_light = rgbToHex(Math.floor(r+((1-(r/255))*fact)));
    var g_light = rgbToHex(Math.floor(g+((1-(g/255))*fact)));
    var b_light = rgbToHex(Math.floor(b+((1-(b/255))*fact)));

    // darker
    var r_dark = rgbToHex(Math.floor(r-((r/255)*(fact*1.5)))); // increase contrast
    var g_dark = rgbToHex(Math.floor(g-((g/255)*(fact*1.5))));
    var b_dark = rgbToHex(Math.floor(b-((b/255)*(fact*1.5))));

    var hexa = code+r_hexa+g_hexa+b_hexa;
    var light = code+r_light+g_light+b_light;
    var dark = code+r_dark+g_dark+b_dark;

    console.log('HEXs -> '+dark+" + "+hexa+" + "+light)

    var colors = [dark, hexa, light]; 
    return colors;

}

在你的ThreeJS代码中简单地写:

var material = new THREE.MeshLambertMaterial();
var c = convertToHex(255,0,0); // red cube needed
material.color.set( Number(c[0]), Number(c[1]), Number(c[2]) );

结果:

//                                 dark      normal     light
convertToHex(255,255,255) HEXs -> 0x696969 + 0xffffff + 0xffffff
convertToHex(255,0,0) HEXs -> 0x690000 + 0xff0000 + 0xff6464
convertToHex(255,127,0) HEXs -> 0x690000 + 0xff0000 + 0xff6464
convertToHex(100,100,100) HEXs -> 0x292929 + 0x646464 + 0xa0a0a0
convertToHex(10,10,10) HEXs -> 0x040404 + 0x0a0a0a + 0x6a6a6a

我为RGB和十六进制颜色做了一个小的Javascript颜色类，这个类还包括RGB和十六进制验证函数。我将代码作为一个片段添加到这个答案中。

var colorClass = function() { this.validateRgb = function(color) { return typeof color === 'object' && color.length === 3 && Math.min.apply(null, color) >= 0 && Math.max.apply(null, color) <= 255; }; this.validateHex = function(color) { return color.match(/^\#?(([0-9a-f]{3}){1,2})$/i); }; this.hexToRgb = function(color) { var hex = color.replace(/^\#/, ''); var length = hex.length; return [ parseInt(length === 6 ? hex['0'] + hex['1'] : hex['0'] + hex['0'], 16), parseInt(length === 6 ? hex['2'] + hex['3'] : hex['1'] + hex['1'], 16), parseInt(length === 6 ? hex['4'] + hex['5'] : hex['2'] + hex['2'], 16) ]; }; this.rgbToHex = function(color) { return '#' + ('0' + parseInt(color['0'], 10).toString(16)).slice(-2) + ('0' + parseInt(color['1'], 10).toString(16)).slice(-2) + ('0' + parseInt(color['2'], 10).toString(16)).slice(-2); }; }; var colors = new colorClass(); console.log(colors.hexToRgb('#FFFFFF'));// [255, 255, 255] console.log(colors.rgbToHex([255, 255, 255]));// #FFFFFF