通过 JavaScript 获取所有命名的 CSS 颜色

Question

有没有办法通过 JavaScript 以编程方式生成浏览器支持的所有命名 CSS 颜色的列表？（.eg Red，Green，AliceBlue等等）

注意：我不是要预编译列表，而是在寻找更类似于 的东西document.body.style，它返回一个具有浏览器支持的所有 css 属性的对象。

Answer 1

我猜你能得到的结果是从预编译的颜色名称列表开始，检查浏览器是否支持该颜色。您可以使用指定颜色

div.stlye.backgroundColor = '';
div.style.backgroundColor = potentialColor;

并检索实际颜色信息

var actualColorString = window.getComputedStyle(div).background; 

如果分配的颜色无效（或黑色），则颜色字符串以

rgba(0, 0, 0, 0)

否则它是一个已知的 CSS 颜色名称。

这是一些演示颜色检查的jsfiddle：

https://jsfiddle.net/tc8f5pgy/4/

我使用此方法为我的项目创建颜色枚举：

https://github.com/stefaneidelloth/treezjs/blob/master/src/components/color/color.js

这是作为 jsfiddle 备份的部分代码：

<div id='color-element'></div>

//source of color names: https://simple.wikipedia.org/wiki/List_of_colors

const colorNames = [
    'Amaranth',
    //...
];

//another source of color names: https://gist.github.com/bobspace/2712980
const cssColorNames = [ 
    "AliceBlue", 
    "AntiqueWhite",
    //...
];

//another source of color names: https://chir.ag/projects/ntc/ntc.js
var extendedColors =  [
    ["000000", "Black"],
    ["000080", "Navy Blue"],
    //...
];

function camelize(str) { //source: https://stackoverflow.com

/questions/2970525/converting-any-string-into-camel-case
  var camelString= str.replace(/(?:^\w|[A-Z]|\b\w)/g, function(word, index) {
    return index === 0 ? word.toLowerCase() : word.toUpperCase();
  }).replace(/\s+/g, '');
  return camelString.replace(/\//g,'').replace(/-/g,'').replace(/'/g,'');
}

function rgba2hex(orig) { //source: /sf/ask/3498190181/
  var a, isPercent,
    rgb = orig.replace(/\s/g, '').match(/^rgba?\((\d+),(\d+),(\d+),?([^,\s)]+)?/i),
    alpha = (rgb && rgb[4] || "").trim(),
    hex = rgb ?
    (rgb[1] | 1 << 8).toString(16).slice(1) +
    (rgb[2] | 1 << 8).toString(16).slice(1) +
    (rgb[3] | 1 << 8).toString(16).slice(1) : orig;

  if (alpha !== "") {
    a = alpha;
  } else {
    a = 01;
  }
  // multiply before convert to HEX
  a = ((a * 255) | 1 << 8).toString(16).slice(1)
  hex = hex + a;

  return hex;
}

function handleActualColor(name, rgbaColorString){
  var hexColorString = rgba2hex(rgbaColorString);
  var output = "Color." + name + " = new Color('"+ name +"','#"+ hexColorString + "');"
  console.log(output);
}

var potentialColorSet = new Set();
for(var colorName of colorNames){
  potentialColorSet.add(camelize(colorName));
}
for(var colorName of cssColorNames){
  potentialColorSet.add(camelize(colorName));
}
for(var entry of extendedColors){
 var colorName = entry[1];
 potentialColorSet.add(camelize(colorName));
}

var potentialColors = Array.from(potentialColorSet).sort();

var div = document.getElementById('color-element');



for(var potentialColor of potentialColors){
  div.style.backgroundColor = '';
  div.style.backgroundColor = potentialColor;
  var actualColorString = window.getComputedStyle(div).background;  
  var endIndex = actualColorString.indexOf(')');
  var rgbaColorString = actualColorString.substring(0, endIndex+1);
  if(rgbaColorString !== 'rgba(0, 0, 0, 0)'){
    handleActualColor(potentialColor, rgbaColorString);
    if(potentialColor == 'screaminGreen'){
        throw new Error('foo');
    }
  }
  if(potentialColor.toLowerCase() === 'black'){
    handleActualColor(potentialColor, rgbaColorString);
  }
  
  
}