投票最多的回答表明，Martin Ankerl的方法比随机十六进制数字更好，尽管我还没有改进Ankerl的方法，但我已经成功地将其翻译成JavaScript。

我想我应该对这个已经非常大的Stack Overflow问题发布一个额外的答案，因为顶部的答案有另一个评论链接到一个带有Ankerl逻辑的JavaScript实现的Gist，而这个链接是坏的(404)。如果我有这样的声誉，我就会简单地注释我创建的jsbin链接。

// Adapted from
// http://jsfiddle.net/Mottie/xcqpF/1/light/
const rgb2hex = (rgb) => {
  return (rgb && rgb.length === 3) ? "#" +
    ("0" + parseInt(rgb[0],10).toString(16)).slice(-2) +
    ("0" + parseInt(rgb[1],10).toString(16)).slice(-2) +
    ("0" + parseInt(rgb[2],10).toString(16)).slice(-2) : '';
}

// The next two methods are converted from Ruby to JavaScript.
// It is sourced from http://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/

// # HSV values in [0..1[
// # returns [r, g, b] values from 0 to 255
const hsv_to_rgb = (h, s, v) => {
  const h_i = Math.floor(h*6)
  const f = h*6 - h_i
  const p = v * (1 - s)
  const q = v * (1 - (f * s))
  const t = v * (1 - (1 - f) * s)
  let r, g, b
  switch(h_i) {
    case(0):
      [r, g, b] = [v, t, p]
      break
    case(1):
      [r, g, b] = [q, v, p]
      break
    case(2):
      [r, g, b] = [p, v, t]
      break
    case(3):
      [r, g, b] = [p, q, v]
      break
    case(4):
      [r, g, b] = [t, p, v]
      break
    case(5):
      [r, g, b] = [v, p, q]
      break
  }
  return [Math.floor(r * 256), Math.floor(g * 256), Math.floor(b * 256)]
}

// # Use the golden ratio
const golden_ratio_conjugate = 0.618033988749895
let h = Math.random() // # Use a random start value
const gen_hex = (numberOfColors) => {
  const colorArray = []
  while (numberOfColors > 0) {
    h += golden_ratio_conjugate
    h %= 1
    colorArray.push(rgb2hex(hsv_to_rgb(h, 0.99, 0.99)))
    numberOfColors -= 1
  }
  console.log(colorArray)
  return colorArray
}

gen_hex(100)

https://jsbin.com/qeyevoj/edit?js,console

这是我的两个版本的随机十六进制代码生成器。

/* Slowest but shortest. */
"#000000".replace(/0/g,function(){return (~~(Math.random()*16)).toString(16);});    

/* Good performance with small size. */
"#"+(function(a,b){while(a--){b+=""+(~~(Math.random()*16)).toString(16);} return b;})(6,"");

/* Remy Sharp provided one that's the fastest but a little bit too long */
(function(h){return '#000000'.substr(0,7-h.length)+h})((~~(Math.random()*(1<<24))).toString(16))

function get_random_color() {
    return "#" + (Math.round(Math.random() * 0XFFFFFF)).toString(16);
}

http://jsfiddle.net/XmqDz/1/

几乎所有以前的速记方法都会生成无效的十六进制代码(五位数)。我在这里遇到了一个类似的技巧，只是没有这个问题:

"#"+(((1+Math.random())*(1<<24)|0).toString(16)).substr(-6)

Test

在控制台试试这个:

for(i = 0; i < 200; i++) {
    console.log("#"+(((1+Math.random())*(1<<24)|0).toString(16)).substr(-6));
}

Use:

function random_color(format)
{
    var rint = Math.round(0xffffff * Math.random());
    switch(format)
    {
        case 'hex':
            return ('#0' + rint.toString(16)).replace(/^#0([0-9a-f]{6})$/i, '#$1');
            break;

        case 'rgb':
            return 'rgb(' + (rint >> 16) + ',' + (rint >> 8 & 255) + ',' + (rint & 255) + ')';
            break;

        default:
            return rint;
            break;
    }
}

升级版:

function random_color( format ){
  var rint = Math.floor( 0x100000000 * Math.random());
  switch( format ){
    case 'hex':
      return '#' + ('00000'   + rint.toString(16)).slice(-6).toUpperCase();
    case 'hexa':
      return '#' + ('0000000' + rint.toString(16)).slice(-8).toUpperCase();
    case 'rgb':
      return 'rgb('  + (rint & 255) + ',' + (rint >> 8 & 255) + ',' + (rint >> 16 & 255) + ')';
    case 'rgba':
      return 'rgba(' + (rint & 255) + ',' + (rint >> 8 & 255) + ',' + (rint >> 16 & 255) + ',' + (rint >> 24 & 255)/255 + ')';
    default:
      return rint;
  }
}

使用getRandomColor()代替“#0000FF”:

function getRandomColor() { var letters = '0123456789ABCDEF'; var color = '#'; for (var i = 0; i < 6; i++) { color += letters[Math.floor(Math.random() * 16)]; } return color; } function setRandomColor() { $("#colorpad").css("background-color", getRandomColor()); } <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="colorpad" style="width:300px;height:300px;background-color:#000"> </div> <button onclick="setRandomColor()">Random Color</button>