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如何获取十六进制颜色值而不是RGB值？

发布于 2024-08-11 17:28:31 字数 130 浏览 8 评论 0原文

使用以下 jQuery 将获取元素背景颜色的 RGB 值：

$('#selector').css('backgroundColor');

有没有办法获取十六进制值而不是 RGB？

原文

Using the following jQuery will get the RGB value of an element's background color:

$('#selector').css('backgroundColor');

Is there a way to get the hex value rather than the RGB?

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评论（25）

中二柚 2024-08-18 17:28:31

TL;DR

使用这个干净的单行函数，同时支持 rgb 和 rgba：

const rgba2hex = (rgba) => `#${rgba.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+\.{0,1}\d*))?\)$/).slice(1).map((n, i) => (i === 3 ? Math.round(parseFloat(n) * 255) : parseFloat(n)).toString(16).padStart(2, '0').replace('NaN', '')).join('')}`

2021 更新的答案

自从我最初回答这个问题以来已经过去了很长时间。然后，很酷的 ECMAScript 5 和 2015+ 功能在浏览器上大量可用，例如 箭头函数、Array.map，字符串.padStart 和模板字符串。几年以来，编写跨浏览器的单行rgb2hex是可能的：

const rgb2hex = (rgb) => `#${rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/).slice(1).map(n => parseInt(n, 10).toString(16).padStart(2, '0')).join('')}`

// Use as you wish...
console.log(rgb2hex('rgb(0,0,0)'))
console.log(rgb2hex('rgb(255, 255, 255)'))
console.log(rgb2hex('rgb(255,0,0)'))
console.log(rgb2hex('rgb(38, 170, 90)'))

它的工作原理是使用正则表达式获取 rgb 字符串中的每个数字，slice(1) 仅获取数字（match的第一个结果） code> 是完整的字符串本身），map 迭代每个数字，每次迭代使用 parseInt 转换为 Number，然后返回到十六进制String（通过以 16 为基数的转换），如果需要，可通过 padStart 添加零。最后，将每个转换/调整的数字连接到一个以'#'开头的唯一String。

当然，我们可以毫不费力地将其扩展为单行 rgba2hex：

const rgba2hex = (rgba) => `#${rgba.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+\.{0,1}\d*))?\)$/).slice(1).map((n, i) => (i === 3 ? Math.round(parseFloat(n) * 255) : parseFloat(n)).toString(16).padStart(2, '0').replace('NaN', '')).join('')}`

// Now it doesn't matter if 'rgb' or 'rgba'...
console.log(rgba2hex('rgb(0,0,0)'))
console.log(rgba2hex('rgb(255, 255, 255)'))
console.log(rgba2hex('rgb(255,0,0)'))
console.log(rgba2hex('rgb(38, 170, 90)'))
console.log(rgba2hex('rgba(255, 0, 0, 0.5)'))
console.log(rgba2hex('rgba(0,255,0,1)'))
console.log(rgba2hex('rgba(127,127,127,0.25)'))

就是这样。但如果您想深入了解旧式 JavaScript 世界，请继续阅读。

2010 年原始答案

这是我根据 @Matt 建议编写的更清晰的解决方案：

function rgb2hex(rgb) {
    rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
    function hex(x) {
        return ("0" + parseInt(x).toString(16)).slice(-2);
    }
    return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

某些浏览器已经返回十六进制颜色（从 Internet Explorer 8 及更低版本开始）。如果您需要处理这些情况，只需在函数内附加一个条件，就像 @gfrobenius 建议的那样：

function rgb2hex(rgb) {
    if (/^#[0-9A-F]{6}$/i.test(rgb)) return rgb;

    rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
    function hex(x) {
        return ("0" + parseInt(x).toString(16)).slice(-2);
    }
    return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

如果您使用 jQuery 并且想要更完整的方法，您可以使用 CSS Hooks 自 jQuery 1.4.3 起可用，正如我在回答此问题时所示：我可以强制 jQuery.css("backgroundColor") 返回十六进制格式吗？

TL;DR

Use this clean one-line function with both rgb and rgba support:

const rgba2hex = (rgba) => `#${rgba.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+\.{0,1}\d*))?\)$/).slice(1).map((n, i) => (i === 3 ? Math.round(parseFloat(n) * 255) : parseFloat(n)).toString(16).padStart(2, '0').replace('NaN', '')).join('')}`

2021 updated answer

Much time has passed since I originally answered this question. Then cool ECMAScript 5 and 2015+ features became largely available on browsers, like arrow functions, Array.map, String.padStart and template strings. Since some years, it's possible to write cross-browser one-liner rgb2hex:

const rgb2hex = (rgb) => `#${rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/).slice(1).map(n => parseInt(n, 10).toString(16).padStart(2, '0')).join('')}`

// Use as you wish...
console.log(rgb2hex('rgb(0,0,0)'))
console.log(rgb2hex('rgb(255, 255, 255)'))
console.log(rgb2hex('rgb(255,0,0)'))
console.log(rgb2hex('rgb(38, 170, 90)'))

It works by using a regular expression to get each digit inside the rgb string, slice(1) to get only the digits (the first result of match is the full string itself), map to iterate through each digit, each iteration converting to Number with parseInt, then back to an hexadecimal String (through a base-16 conversion), adding zero if needed via padStart. Finally, join each converted/adjusted digit to a unique String starting with '#'.

Of course, we could extend it without much effort as an one-liner rgba2hex:

const rgba2hex = (rgba) => `#${rgba.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+\.{0,1}\d*))?\)$/).slice(1).map((n, i) => (i === 3 ? Math.round(parseFloat(n) * 255) : parseFloat(n)).toString(16).padStart(2, '0').replace('NaN', '')).join('')}`

// Now it doesn't matter if 'rgb' or 'rgba'...
console.log(rgba2hex('rgb(0,0,0)'))
console.log(rgba2hex('rgb(255, 255, 255)'))
console.log(rgba2hex('rgb(255,0,0)'))
console.log(rgba2hex('rgb(38, 170, 90)'))
console.log(rgba2hex('rgba(255, 0, 0, 0.5)'))
console.log(rgba2hex('rgba(0,255,0,1)'))
console.log(rgba2hex('rgba(127,127,127,0.25)'))

And that's it. But if you want to dive deep in the old school JavaScript world, keep reading.

Original 2010 answer

Here is the cleaner solution I wrote based on @Matt suggestion:

function rgb2hex(rgb) {
    rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
    function hex(x) {
        return ("0" + parseInt(x).toString(16)).slice(-2);
    }
    return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

Some browsers already returns colors as hexadecimal (as of Internet Explorer 8 and below). If you need to deal with those cases, just append a condition inside the function, like @gfrobenius suggested:

function rgb2hex(rgb) {
    if (/^#[0-9A-F]{6}$/i.test(rgb)) return rgb;

    rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
    function hex(x) {
        return ("0" + parseInt(x).toString(16)).slice(-2);
    }
    return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

If you're using jQuery and want a more complete approach, you can use CSS Hooks available since jQuery 1.4.3, as I showed when answering this question: Can I force jQuery.css("backgroundColor") returns on hexadecimal format?

回复 原文
诺曦 2024-08-18 17:28:31
var hexDigits = new Array
        ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"); 

//Function to convert rgb color to hex format
function rgb2hex(rgb) {
 rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
 return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

function hex(x) {
  return isNaN(x) ? "00" : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
 }

（来源）

var hexDigits = new Array
        ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"); 

//Function to convert rgb color to hex format
function rgb2hex(rgb) {
 rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
 return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

function hex(x) {
  return isNaN(x) ? "00" : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
 }

(Source)

回复 原文
念﹏祤嫣 2024-08-18 17:28:31

大多数浏览器在使用时似乎都返回RGB值：

$('#selector').css('backgroundColor');

只有IE（目前仅测试了6个）返回Hex值。

为了避免 IE 中出现错误消息，您可以将该函数包装在 if 语句中：

function rgb2hex(rgb) {
     if (  rgb.search("rgb") == -1 ) {
          return rgb;
     } else {
          rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
          function hex(x) {
               return ("0" + parseInt(x).toString(16)).slice(-2);
          }
          return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]); 
     }
}

Most browsers seem to return the RGB value when using:

$('#selector').css('backgroundColor');

Only I.E (only 6 tested so far) returns the Hex value.

To avoid error messages in I.E, you could wrap the function in an if statement:

function rgb2hex(rgb) {
     if (  rgb.search("rgb") == -1 ) {
          return rgb;
     } else {
          rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
          function hex(x) {
               return ("0" + parseInt(x).toString(16)).slice(-2);
          }
          return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]); 
     }
}
回复 原文
腻橙味 2024-08-18 17:28:31

更新了 @ErickPetru 以实现 rgba 兼容性：

function rgb2hex(rgb) {
    rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
    function hex(x) {
        return ("0" + parseInt(x).toString(16)).slice(-2);
    }
    return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

我更新了正则表达式以匹配 alpha 值（如果已定义），但不使用它。

Updated @ErickPetru for rgba compatibility:

function rgb2hex(rgb) {
    rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
    function hex(x) {
        return ("0" + parseInt(x).toString(16)).slice(-2);
    }
    return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

I updated the regex to match the alpha value if defined, but not use it.

回复 原文
年少掌心 2024-08-18 17:28:31

这是一个不使用 jQuery 的 ES6 oneliner：

var rgb = document.querySelector('#selector').style['background-color'];
return '#' + rgb.substr(4, rgb.indexOf(')') - 4).split(',').map((color) => parseInt(color).toString(16).padStart(2, '0')).join('');

Here's an ES6 one liner that doesn't use jQuery:

var rgb = document.querySelector('#selector').style['background-color'];
return '#' + rgb.substr(4, rgb.indexOf(')') - 4).split(',').map((color) => parseInt(color).toString(16).padStart(2, '0')).join('');
回复 原文
烂人 2024-08-18 17:28:31

这是一个还检查透明的版本，我需要这个，因为我的目标是将结果插入到样式属性中，其中十六进制颜色的透明版本实际上是单词“透明”。

function rgb2hex(rgb) {
     if (  rgb.search("rgb") == -1 ) {
          return rgb;
     }
     else if ( rgb == 'rgba(0, 0, 0, 0)' ) {
         return 'transparent';
     }
     else {
          rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
          function hex(x) {
               return ("0" + parseInt(x).toString(16)).slice(-2);
          }
          return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]); 
     }
}

Here is a version that also checks for transparent, I needed this since my object was to insert the result into a style attribute, where the transparent version of a hex color is actually the word "transparent"..

function rgb2hex(rgb) {
     if (  rgb.search("rgb") == -1 ) {
          return rgb;
     }
     else if ( rgb == 'rgba(0, 0, 0, 0)' ) {
         return 'transparent';
     }
     else {
          rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
          function hex(x) {
               return ("0" + parseInt(x).toString(16)).slice(-2);
          }
          return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]); 
     }
}
回复 原文
回心转意 2024-08-18 17:28:31

短的

// c - color str e.g."rgb(12,233,43)", result color hex e.g. "#0ce92b"
let rgb2hex=c=>'#'+c.match(/\d+/g).map(x=>(+x).toString(16).padStart(2,0)).join``


// rgb - color str e.g."rgb(12,233,43)", result color hex e.g. "#0ce92b"
let rgb2hex= c=> '#'+c.match(/\d+/g).map(x=>(+x).toString(16).padStart(2,0)).join``

console.log(rgb2hex("rgb(12,233,43"));

Short

// c - color str e.g."rgb(12,233,43)", result color hex e.g. "#0ce92b"
let rgb2hex=c=>'#'+c.match(/\d+/g).map(x=>(+x).toString(16).padStart(2,0)).join``


// rgb - color str e.g."rgb(12,233,43)", result color hex e.g. "#0ce92b"
let rgb2hex= c=> '#'+c.match(/\d+/g).map(x=>(+x).toString(16).padStart(2,0)).join``

console.log(rgb2hex("rgb(12,233,43"));

回复 原文
∞琼窗梦回ˉ 2024-08-18 17:28:31

以十六进制形式返回元素背景颜色的函数。

function getBgColorHex(elem){
    var color = elem.css('background-color')
    var hex;
    if(color.indexOf('#')>-1){
        //for IE
        hex = color;
    } else {
        var rgb = color.match(/\d+/g);
        hex = '#'+ ('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);
    }
    return hex;
}

用法示例：

$('#div1').click(function(){
   alert(getBgColorHex($(this));
}

jsfiddle

Function that returns background color of an element in hex.

function getBgColorHex(elem){
    var color = elem.css('background-color')
    var hex;
    if(color.indexOf('#')>-1){
        //for IE
        hex = color;
    } else {
        var rgb = color.match(/\d+/g);
        hex = '#'+ ('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);
    }
    return hex;
}

usage example:

$('#div1').click(function(){
   alert(getBgColorHex($(this));
}

jsfiddle

回复 原文
甜警司 2024-08-18 17:28:31

可读&&无 Reg-exp（无 Reg-exp）

我创建了一个使用可读基本函数且无 reg-exp 的函数。

该函数接受十六进制、rgb 或 rgba CSS 格式的颜色并返回十六进制表示形式。

编辑：解析 rgba() 格式时出现错误，已修复...

function getHexColor( color ){
    //if color is already in hex, just return it...
    if( color.indexOf('#') != -1 ) return color;
    
    //leave only "R,G,B" :
    color = color
                .replace("rgba", "") //must go BEFORE rgb replace
                .replace("rgb", "")
                .replace("(", "")
                .replace(")", "");
    color = color.split(","); // get Array["R","G","B"]
    
    // 0) add leading #
    // 1) add leading zero, so we get 0XY or 0X
    // 2) append leading zero with parsed out int value of R/G/B
    //    converted to HEX string representation
    // 3) slice out 2 last chars (get last 2 chars) => 
    //    => we get XY from 0XY and 0X stays the same
    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);
}

Readable && Reg-exp free (no Reg-exp)

I've created a function that uses readable basic functions and no reg-exps.

The function accepts color in hex, rgb or rgba CSS format and returns hex representation.

EDIT: there was a bug with parsing out rgba() format, fixed...

function getHexColor( color ){
    //if color is already in hex, just return it...
    if( color.indexOf('#') != -1 ) return color;
    
    //leave only "R,G,B" :
    color = color
                .replace("rgba", "") //must go BEFORE rgb replace
                .replace("rgb", "")
                .replace("(", "")
                .replace(")", "");
    color = color.split(","); // get Array["R","G","B"]
    
    // 0) add leading #
    // 1) add leading zero, so we get 0XY or 0X
    // 2) append leading zero with parsed out int value of R/G/B
    //    converted to HEX string representation
    // 3) slice out 2 last chars (get last 2 chars) => 
    //    => we get XY from 0XY and 0X stays the same
    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);
}
回复 原文
二手情话 2024-08-18 17:28:31

相同的答案像@Jim F答案但ES6语法，所以，更少的指令：

const rgb2hex = (rgb) => {
  if (rgb.search("rgb") === -1) return rgb;
  rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
  const hex = (x) => ("0" + parseInt(x).toString(16)).slice(-2);
  return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
};

Same answer like @Jim F answer but ES6 syntax , so, less instructions :

const rgb2hex = (rgb) => {
  if (rgb.search("rgb") === -1) return rgb;
  rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
  const hex = (x) => ("0" + parseInt(x).toString(16)).slice(-2);
  return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
};
回复 原文
晨与橙与城 2024-08-18 17:28:31

从引导颜色选择器获取的颜色类

// Color object
var Color = function(val) {
    this.value = {
        h: 1,
        s: 1,
        b: 1,
        a: 1
    };
    this.setColor(val);
};

Color.prototype = {
    constructor: Color,

    //parse a string to HSB
    setColor: function(val){
        val = val.toLowerCase();
        var that = this;
        $.each( CPGlobal.stringParsers, function( i, parser ) {
            var match = parser.re.exec( val ),
            values = match && parser.parse( match ),
            space = parser.space||'rgba';
            if ( values ) {
                if (space === 'hsla') {
                    that.value = CPGlobal.RGBtoHSB.apply(null, CPGlobal.HSLtoRGB.apply(null, values));
                } else {
                    that.value = CPGlobal.RGBtoHSB.apply(null, values);
                }
                return false;
            }
        });
    },

    setHue: function(h) {
        this.value.h = 1- h;
    },

    setSaturation: function(s) {
        this.value.s = s;
    },

    setLightness: function(b) {
        this.value.b = 1- b;
    },

    setAlpha: function(a) {
        this.value.a = parseInt((1 - a)*100, 10)/100;
    },

    // HSBtoRGB from RaphaelJS
    // https://github.com/DmitryBaranovskiy/raphael/
    toRGB: function(h, s, b, a) {
        if (!h) {
            h = this.value.h;
            s = this.value.s;
            b = this.value.b;
        }
        h *= 360;
        var R, G, B, X, C;
        h = (h % 360) / 60;
        C = b * s;
        X = C * (1 - Math.abs(h % 2 - 1));
        R = G = B = b - C;

        h = ~~h;
        R += [C, X, 0, 0, X, C][h];
        G += [X, C, C, X, 0, 0][h];
        B += [0, 0, X, C, C, X][h];
        return {
            r: Math.round(R*255),
            g: Math.round(G*255),
            b: Math.round(B*255),
            a: a||this.value.a
        };
    },

    toHex: function(h, s, b, a){
        var rgb = this.toRGB(h, s, b, a);
        return '#'+((1 << 24) | (parseInt(rgb.r) << 16) | (parseInt(rgb.g) << 8) | parseInt(rgb.b)).toString(16).substr(1);
    },

    toHSL: function(h, s, b, a){
        if (!h) {
            h = this.value.h;
            s = this.value.s;
            b = this.value.b;
        }
        var H = h,
        L = (2 - s) * b,
        S = s * b;
        if (L > 0 && L <= 1) {
            S /= L;
        } else {
            S /= 2 - L;
        }
        L /= 2;
        if (S > 1) {
            S = 1;
        }
        return {
            h: H,
            s: S,
            l: L,
            a: a||this.value.a
        };
    }
};

如何使用

var color = new Color("RGB(0,5,5)");
color.toHex()

color class taken from bootstrap color picker

// Color object
var Color = function(val) {
    this.value = {
        h: 1,
        s: 1,
        b: 1,
        a: 1
    };
    this.setColor(val);
};

Color.prototype = {
    constructor: Color,

    //parse a string to HSB
    setColor: function(val){
        val = val.toLowerCase();
        var that = this;
        $.each( CPGlobal.stringParsers, function( i, parser ) {
            var match = parser.re.exec( val ),
            values = match && parser.parse( match ),
            space = parser.space||'rgba';
            if ( values ) {
                if (space === 'hsla') {
                    that.value = CPGlobal.RGBtoHSB.apply(null, CPGlobal.HSLtoRGB.apply(null, values));
                } else {
                    that.value = CPGlobal.RGBtoHSB.apply(null, values);
                }
                return false;
            }
        });
    },

    setHue: function(h) {
        this.value.h = 1- h;
    },

    setSaturation: function(s) {
        this.value.s = s;
    },

    setLightness: function(b) {
        this.value.b = 1- b;
    },

    setAlpha: function(a) {
        this.value.a = parseInt((1 - a)*100, 10)/100;
    },

    // HSBtoRGB from RaphaelJS
    // https://github.com/DmitryBaranovskiy/raphael/
    toRGB: function(h, s, b, a) {
        if (!h) {
            h = this.value.h;
            s = this.value.s;
            b = this.value.b;
        }
        h *= 360;
        var R, G, B, X, C;
        h = (h % 360) / 60;
        C = b * s;
        X = C * (1 - Math.abs(h % 2 - 1));
        R = G = B = b - C;

        h = ~~h;
        R += [C, X, 0, 0, X, C][h];
        G += [X, C, C, X, 0, 0][h];
        B += [0, 0, X, C, C, X][h];
        return {
            r: Math.round(R*255),
            g: Math.round(G*255),
            b: Math.round(B*255),
            a: a||this.value.a
        };
    },

    toHex: function(h, s, b, a){
        var rgb = this.toRGB(h, s, b, a);
        return '#'+((1 << 24) | (parseInt(rgb.r) << 16) | (parseInt(rgb.g) << 8) | parseInt(rgb.b)).toString(16).substr(1);
    },

    toHSL: function(h, s, b, a){
        if (!h) {
            h = this.value.h;
            s = this.value.s;
            b = this.value.b;
        }
        var H = h,
        L = (2 - s) * b,
        S = s * b;
        if (L > 0 && L <= 1) {
            S /= L;
        } else {
            S /= 2 - L;
        }
        L /= 2;
        if (S > 1) {
            S = 1;
        }
        return {
            h: H,
            s: S,
            l: L,
            a: a||this.value.a
        };
    }
};

how to use

var color = new Color("RGB(0,5,5)");
color.toHex()
回复 原文
懒猫 2024-08-18 17:28:31

只是添加到上面@Justin的答案..

它应该是

var rgb = document.querySelector('#selector').style['background-color'];
return '#' + rgb.substr(4, rgb.indexOf(')') - 4).split(',').map((color) => String("0" + parseInt(color).toString(16)).slice(-2)).join('');

由于上面的parse int函数截断前导零，因此产生5或4个字母的错误颜色代码可能是...即对于rgb(216, 160, 10)它产生#d8a0a，而它应该是#d8a00a。

谢谢

Just to add to @Justin's answer above..

it should be

var rgb = document.querySelector('#selector').style['background-color'];
return '#' + rgb.substr(4, rgb.indexOf(')') - 4).split(',').map((color) => String("0" + parseInt(color).toString(16)).slice(-2)).join('');

As the above parse int functions truncates leading zeroes, thus produces incorrect color codes of 5 or 4 letters may be... i.e. for rgb(216, 160, 10) it produces #d8a0a while it should be #d8a00a.

Thanks

回复 原文
等数载，海棠开 2024-08-18 17:28:31

这个看起来好一点：

var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var r   = parseInt(rgb[0], 10);
var g   = parseInt(rgb[1], 10);
var b   = parseInt(rgb[2], 10);
var hex = '#'+ r.toString(16) + g.toString(16) + b.toString(16);

更简洁的一句话：

var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var hex = '#'+ Number(rgb[0]).toString(16) + Number(rgb[1]).toString(16) + Number(rgb[2]).toString(16);

强制 jQuery 总是返回十六进制：

$.cssHooks.backgroundColor = {
    get: function(elem) {
        if (elem.currentStyle)
            var bg = elem.currentStyle["backgroundColor"];
        else if (window.getComputedStyle) {
            var bg = document.defaultView.getComputedStyle(elem,
                null).getPropertyValue("background-color");
        }
        if (bg.search("rgb") == -1) {
            return bg;
        } else {
            bg = bg.match(/\d+/g);
            function hex(x) {
                return ("0" + parseInt(x).toString(16)).slice(-2);
            }
            return "#" + hex(bg[0]) + hex(bg[1]) + hex(bg[2]);
        }
    }
}

This one looks a bit nicer:

var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var r   = parseInt(rgb[0], 10);
var g   = parseInt(rgb[1], 10);
var b   = parseInt(rgb[2], 10);
var hex = '#'+ r.toString(16) + g.toString(16) + b.toString(16);

a more succinct one-liner:

var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var hex = '#'+ Number(rgb[0]).toString(16) + Number(rgb[1]).toString(16) + Number(rgb[2]).toString(16);

forcing jQuery to always return hex:

$.cssHooks.backgroundColor = {
    get: function(elem) {
        if (elem.currentStyle)
            var bg = elem.currentStyle["backgroundColor"];
        else if (window.getComputedStyle) {
            var bg = document.defaultView.getComputedStyle(elem,
                null).getPropertyValue("background-color");
        }
        if (bg.search("rgb") == -1) {
            return bg;
        } else {
            bg = bg.match(/\d+/g);
            function hex(x) {
                return ("0" + parseInt(x).toString(16)).slice(-2);
            }
            return "#" + hex(bg[0]) + hex(bg[1]) + hex(bg[2]);
        }
    }
}
回复 原文
挽梦忆笙歌 2024-08-18 17:28:31

由于问题是使用 JQuery，因此这里有一个基于 Daniel Elliott 代码的 JQuery 插件：

$.fn.cssAsHex = function(colorProp) {

    var hexDigits = '0123456789abcdef';

    function hex(x) {
        return isNaN(x) ? '00' : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
    };

    // Convert RGB color to Hex format
    function rgb2hex(rgb) {
        var rgbRegex = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
        return '#' + hex(rgbRegex[1]) + hex(rgbRegex[2]) + hex(rgbRegex[3]);
    };

    return rgb2hex(this.css(colorProp));
};

使用它如下：

var hexBackgroundColor = $('#myElement').cssAsHex('background-color');

Since the question was using JQuery, here’s a JQuery plugin based on Daniel Elliott’s code:

$.fn.cssAsHex = function(colorProp) {

    var hexDigits = '0123456789abcdef';

    function hex(x) {
        return isNaN(x) ? '00' : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
    };

    // Convert RGB color to Hex format
    function rgb2hex(rgb) {
        var rgbRegex = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
        return '#' + hex(rgbRegex[1]) + hex(rgbRegex[2]) + hex(rgbRegex[3]);
    };

    return rgb2hex(this.css(colorProp));
};

Use it like:

var hexBackgroundColor = $('#myElement').cssAsHex('background-color');
回复 原文
著墨染雨君画夕 2024-08-18 17:28:31

这是我发现的解决方案，不会在 IE 中引发脚本错误：
http://haacked.com/archive/2009/12 /29/convert-rgb-to-hex.aspx

Here's a solution I found that does not throw scripting errors in IE:
http://haacked.com/archive/2009/12/29/convert-rgb-to-hex.aspx

回复 原文
随风而去 2024-08-18 17:28:31

Steven Pribilinskiy 的答案去掉了前导零，例如#ff0000 变为#ff00。

解决方案是附加前导 0 和最后 2 位数字的子字符串。

var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var hex = '#'+ String('0' + Number(rgb[0]).toString(16)).slice(-2) + String('0' + Number(rgb[1]).toString(16)).slice(-2) + String('0' + Number(rgb[2]).toString(16)).slice(-2);

Steven Pribilinskiy's answer drops leading zeroes, for example #ff0000 becomes #ff00.

A solution is to append a leading 0 and substring off the last 2 digits.

var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var hex = '#'+ String('0' + Number(rgb[0]).toString(16)).slice(-2) + String('0' + Number(rgb[1]).toString(16)).slice(-2) + String('0' + Number(rgb[2]).toString(16)).slice(-2);
回复 原文
如果没结果 2024-08-18 17:28:31

改进的函数“hex”

function hex(x){
    return isNaN(x) ? "00" : hexDigits[x >> 4] + hexDigits[x & 0xf];
    // or option without hexDigits array
    return (x >> 4).toString(16)+(x & 0xf).toString(16);
}

Improved function "hex"

function hex(x){
    return isNaN(x) ? "00" : hexDigits[x >> 4] + hexDigits[x & 0xf];
    // or option without hexDigits array
    return (x >> 4).toString(16)+(x & 0xf).toString(16);
}
回复 原文
ˇ宁静的妩媚 2024-08-18 17:28:31

这是我的解决方案，也 touppercase使用参数并检查提供的字符串中其他可能的空格和大写。

var a = "rgb(10, 128, 255)";
var b = "rgb( 10, 128, 255)";
var c = "rgb(10, 128, 255 )";
var d = "rgb ( 10, 128, 255 )";
var e = "RGB ( 10, 128, 255 )";
var f = "rgb(10,128,255)";
var g = "rgb(10, 128,)";

var rgbToHex = (function () {
    var rx = /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i;

    function pad(num) {
        if (num.length === 1) {
            num = "0" + num;
        }

        return num;
    }

    return function (rgb, uppercase) {
        var rxArray = rgb.match(rx),
            hex;

        if (rxArray !== null) {
            hex = pad(parseInt(rxArray[1], 10).toString(16)) + pad(parseInt(rxArray[2], 10).toString(16)) + pad(parseInt(rxArray[3], 10).toString(16));

            if (uppercase === true) {
                hex = hex.toUpperCase();
            }

            return hex;
        }

        return;
    };
}());

console.log(rgbToHex(a));
console.log(rgbToHex(b, true));
console.log(rgbToHex(c));
console.log(rgbToHex(d));
console.log(rgbToHex(e));
console.log(rgbToHex(f));
console.log(rgbToHex(g));

jsfiddle

jsperf

进一步的改进可能是 trim() rgb 字符串

var rxArray = rgb.trim().match(rx),

Here is my solution, also does touppercase by the use of an argument and checks for other possible white-spaces and capitalisation in the supplied string.

var a = "rgb(10, 128, 255)";
var b = "rgb( 10, 128, 255)";
var c = "rgb(10, 128, 255 )";
var d = "rgb ( 10, 128, 255 )";
var e = "RGB ( 10, 128, 255 )";
var f = "rgb(10,128,255)";
var g = "rgb(10, 128,)";

var rgbToHex = (function () {
    var rx = /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i;

    function pad(num) {
        if (num.length === 1) {
            num = "0" + num;
        }

        return num;
    }

    return function (rgb, uppercase) {
        var rxArray = rgb.match(rx),
            hex;

        if (rxArray !== null) {
            hex = pad(parseInt(rxArray[1], 10).toString(16)) + pad(parseInt(rxArray[2], 10).toString(16)) + pad(parseInt(rxArray[3], 10).toString(16));

            if (uppercase === true) {
                hex = hex.toUpperCase();
            }

            return hex;
        }

        return;
    };
}());

console.log(rgbToHex(a));
console.log(rgbToHex(b, true));
console.log(rgbToHex(c));
console.log(rgbToHex(d));
console.log(rgbToHex(e));
console.log(rgbToHex(f));
console.log(rgbToHex(g));

On jsfiddle

Speed comparison on jsperf

A further improvement could be to trim() the rgb string

var rxArray = rgb.trim().match(rx),
回复 原文
原来是傀儡 2024-08-18 17:28:31

我漂亮的非标准解决方案

HTML

<div id="selector" style="background-color:#f5b405"></div>

jQuery

$("#selector").attr("style").replace("background-color:", "");

Result

#f5b405

My beautiful non-standard solution

HTML

<div id="selector" style="background-color:#f5b405"></div>

jQuery

$("#selector").attr("style").replace("background-color:", "");

Result

#f5b405
回复 原文
极度宠爱 2024-08-18 17:28:31

将 RGB 转换为十六进制

我正在使用 Jasmine 量角器，并且收到如下错误
- 预期 [ 'rgba(255, 255, 255, 1)' ] 包含 '#fff'。
下面的功能对我来说效果很好。

function RGBAToHexA(test:string) {
let sep = test.toString().indexOf(",") > -1 ? "," : " ";
const rgba = test.toString().substring(5).split(")")[0].split(sep);
console.log(rgba)
let r = (+rgba[0]).toString(16),
  g = (+rgba[1]).toString(16),
  b = (+rgba[2]).toString(16),
  a = Math.round(+rgba[3] * 255).toString(16);

    if (r.length == 1)
        r = "0" + r;
    if (g.length == 1)
        g = "0" + g;
    if (b.length == 1)
        b = "0" + b;
    if (a.length == 1)
        a = "0" + a;

return "#" + r + g + b + a;

}

describe('Check CSS', function() {
 
it('should check css of login page', async function(){
        browser.waitForAngularEnabled(true);
        browser.actions().mouseMove(element(by.css('.btn-auth, .btn-auth:hover'))).perform(); // mouse hover on button
        csspage.Loc_auth_btn.getCssValue('color').then(function(color){
            console.log(RGBAToHexA(color))
            expect( RGBAToHexA(color)).toContain(cssData.hoverauth.color);

        })

Convert RGB to Hex

I am using Jasmine protractor and I was getting errors like
- Expected [ 'rgba(255, 255, 255, 1)' ] to contain '#fff'.
Below function worked fine for me.

function RGBAToHexA(test:string) {
let sep = test.toString().indexOf(",") > -1 ? "," : " ";
const rgba = test.toString().substring(5).split(")")[0].split(sep);
console.log(rgba)
let r = (+rgba[0]).toString(16),
  g = (+rgba[1]).toString(16),
  b = (+rgba[2]).toString(16),
  a = Math.round(+rgba[3] * 255).toString(16);

    if (r.length == 1)
        r = "0" + r;
    if (g.length == 1)
        g = "0" + g;
    if (b.length == 1)
        b = "0" + b;
    if (a.length == 1)
        a = "0" + a;

return "#" + r + g + b + a;

}

describe('Check CSS', function() {
 
it('should check css of login page', async function(){
        browser.waitForAngularEnabled(true);
        browser.actions().mouseMove(element(by.css('.btn-auth, .btn-auth:hover'))).perform(); // mouse hover on button
        csspage.Loc_auth_btn.getCssValue('color').then(function(color){
            console.log(RGBAToHexA(color))
            expect( RGBAToHexA(color)).toContain(cssData.hoverauth.color);

        })
回复 原文
坚持沉默 2024-08-18 17:28:31

对于所有函数式编程爱好者，这里有一个有点函数式的方法:)

const getHexColor = (rgbValue) =>
  rgbValue.replace("rgb(", "").replace(")", "").split(",")
    .map(colorValue => (colorValue > 15 ? "0" : "") + colorValue.toString(16))
    .reduce((acc, hexValue) => acc + hexValue, "#")

然后像这样使用它：

const testRGB = "rgb(13,23,12)"
getHexColor(testRGB)

To all the Functional Programming lovers, here is a somewhat functional approach :)

const getHexColor = (rgbValue) =>
  rgbValue.replace("rgb(", "").replace(")", "").split(",")
    .map(colorValue => (colorValue > 15 ? "0" : "") + colorValue.toString(16))
    .reduce((acc, hexValue) => acc + hexValue, "#")

then use it like:

const testRGB = "rgb(13,23,12)"
getHexColor(testRGB)
回复 原文
画中仙 2024-08-18 17:28:31

我的紧凑版

//Function to convert rgb color to hex format
function rgb2hex(rgb) {
    if(/^#/.test(rgb))return rgb;// if returns colors as hexadecimal
    let re = /\d+/g;
    let hex = x => (x >> 4).toString(16)+(x & 0xf).toString(16);
    return "#"+hex(re.exec(rgb))+hex(re.exec(rgb))+hex(re.exec(rgb));
}

my compact version

//Function to convert rgb color to hex format
function rgb2hex(rgb) {
    if(/^#/.test(rgb))return rgb;// if returns colors as hexadecimal
    let re = /\d+/g;
    let hex = x => (x >> 4).toString(16)+(x & 0xf).toString(16);
    return "#"+hex(re.exec(rgb))+hex(re.exec(rgb))+hex(re.exec(rgb));
}

回复 原文
逐鹿 2024-08-18 17:28:31

完整案例（rgb、rgba、透明...等）解决方案（coffeeScript）

 rgb2hex: (rgb, transparentDefault=null)->
    return null unless rgb
    return rgb if rgb.indexOf('#') != -1
    return transparentDefault || 'transparent' if rgb == 'rgba(0, 0, 0, 0)'
    rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
    hex = (x)->
      ("0" + parseInt(x).toString(16)).slice(-2)

    '#' + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3])

full cases (rgb, rgba, transparent...etc) solution (coffeeScript)

 rgb2hex: (rgb, transparentDefault=null)->
    return null unless rgb
    return rgb if rgb.indexOf('#') != -1
    return transparentDefault || 'transparent' if rgb == 'rgba(0, 0, 0, 0)'
    rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
    hex = (x)->
      ("0" + parseInt(x).toString(16)).slice(-2)

    '#' + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3])
回复 原文
忆伤 2024-08-18 17:28:31

colord 包可能是最好的选择，它虽小但功能强大。

import { colord } from "colord";

colord("rgb(192, 192, 192)").toHex();

The colord package might be the best choice which is tiny but powerful.

import { colord } from "colord";

colord("rgb(192, 192, 192)").toHex();
回复 原文
楠木可依 2024-08-18 17:28:31

您好，这是我使用 Javascript 获取元素颜色后的解决方案

function rgb_hex(rgb_string_js){ //example: "rgb(102,54,255)"
  var new_rgb_list = rgb_string_js.replace("rgb(","").replace(")","").split(",");
  return ("#" + parseInt(new_rgb_list[0]).toString(16) + parseInt(new_rgb_list[1]).toString(16) + parseInt(new_rgb_list[2]).toString(16)); 
}

Hi here's my solution after getting the element's color with Javascript

function rgb_hex(rgb_string_js){ //example: "rgb(102,54,255)"
  var new_rgb_list = rgb_string_js.replace("rgb(","").replace(")","").split(",");
  return ("#" + parseInt(new_rgb_list[0]).toString(16) + parseInt(new_rgb_list[1]).toString(16) + parseInt(new_rgb_list[2]).toString(16)); 
}
回复 原文
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