如何将颜色在RGB格式转换为十六进制格式,反之亦然?
例如,将'#0080C0'转换为(0,128,192)。
如何将颜色在RGB格式转换为十六进制格式,反之亦然?
例如,将'#0080C0'转换为(0,128,192)。
当前回答
哇。这些答案都不能处理分数的边缘情况,等等。当r, g, b为零时,位移版本也不起作用。
这是一个可以处理r g b是小数的版本。它对颜色之间的插值很有用,所以我也包括了这段代码。但它仍然不能处理r, g, b在0-255范围之外的情况
/**
* Operates with colors.
* @class Q.Colors
*/
Q.Color = {
/**
* Get a color somewhere between startColor and endColor
* @method toHex
* @static
* @param {String|Number} startColor
* @param {String|Number} endColor
* @param {String|Number} fraction
* @returns {String} a color as a hex string without '#' in front
*/
toHex: function (r, g, b) {
return [r, g, b].map(x => {
const hex = Math.round(x).toString(16)
return hex.length === 1 ? '0' + hex : hex
}).join('');
},
/**
* Get a color somewhere between startColor and endColor
* @method between
* @static
* @param {String|Number} startColor
* @param {String|Number} endColor
* @param {String|Number} fraction
* @returns {String} a color as a hex string without '#' in front
*/
between: function(startColor, endColor, fraction) {
if (typeof startColor === 'string') {
startColor = parseInt(startColor.replace('#', '0x'), 16);
}
if (typeof endColor === 'string') {
endColor = parseInt(endColor.replace('#', '0x'), 16);
}
var startRed = (startColor >> 16) & 0xFF;
var startGreen = (startColor >> 8) & 0xFF;
var startBlue = startColor & 0xFF;
var endRed = (endColor >> 16) & 0xFF;
var endGreen = (endColor >> 8) & 0xFF;
var endBlue = endColor & 0xFF;
var newRed = startRed + fraction * (endRed - startRed);
var newGreen = startGreen + fraction * (endGreen - startGreen);
var newBlue = startBlue + fraction * (endBlue - startBlue);
return Q.Color.toHex(newRed, newGreen, newBlue);
},
/**
* Sets a new theme-color on the window
* @method setWindowTheme
* @static
* @param {String} color in any CSS format, such as "#aabbcc"
* @return {String} the previous color
*/
setWindowTheme: function (color) {
var meta = document.querySelector('meta[name="theme-color"]');
var prevColor = null;
if (meta) {
prevColor = meta.getAttribute('content');
}
if (color) {
if (!meta) {
meta = document.createElement('meta');
meta.setAttribute('name', 'theme-color');
}
meta.setAttribute('content', color);
}
return prevColor;
},
/**
* Gets the current window theme color
* @method getWindowTheme
* @static
* @param {String} color in any CSS format, such as "#aabbcc"
* @return {String} the previous color
*/
getWindowTheme: function () {
var meta = document.querySelector('meta[name="theme-color"]');
return meta.getAttribute('content');
}
}
其他回答
我假设您指的是html风格的十六进制符号,即#rrggbb。你的代码几乎是正确的,只是顺序颠倒了。它应该是:
var decColor = red * 65536 + green * 256 + blue;
此外,使用位移位可能会让它更容易阅读:
var decColor = (red << 16) + (green << 8) + blue;
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;
短箭头函数
对于那些重视短箭头功能的人。
Hex2rgb
大卫的答案的箭头函数版本
const hex2rgb = h => [(x=parseInt(h,16)) >> 16 & 255,x >> 8 & 255, x & 255];
一个更灵活的解决方案,支持短十六进制或哈希#
const hex2rgb = h => {
if(h[0] == '#') {h = h.slice(1)};
if(h.length <= 3) {h = h[0]+h[0]+h[1]+h[1]+h[2]+h[2]};
h = parseInt(h,16);
return [h >> 16 & 255,h >> 8 & 255, h & 255];
};
Rgb2hex
const rgb2hex = (r,g,b) => ((1<<24)+(r<<16)+(g<<8)+b).toString(16).slice(1);
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)));
接受字符串的简写版本:
function rgbToHex(a){ a=a.replace(/[^\d,]/g,“”).split(“,”); return“#”+((1<<24)+(+a[0]<<16)+(+a[1]<<8)+ +a[2]).toString(16).slice(1) } document.write(rgbToHex(“rgb(255,255,255)”));
来检查它是否已经是十六进制
function rgbToHex(a){ if(~a.indexOf(“#”))返回 a; a=a.replace(/[^\d,]/g,“”).split(“,”); return“#”+((1<<24)+(+a[0]<<16)+(+a[1]<<8)+ +a[2]).toString(16).slice(1) } document.write(“rgb: ”+rgbToHex(“rgb(255,255,255)”)+ “ -- hex: ”+rgbToHex(“#e2e2e2”));