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
HTML converer :)
<!DOCTYPE html>
<html>
<body>
<p id="res"></p>
<script>
function hexToRgb(hex) {
var res = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return "(" + parseInt(res[1], 16) + "," + parseInt(res[2], 16) + "," + parseInt(res[3], 16) + ")";
};
document.getElementById("res").innerHTML = hexToRgb('#0080C0');
</script>
</body>
</html>
其他回答
我给洛达什做了这个。它将一个RGB字符串，如“30,209,19”转换为其对应的十六进制字符串“#1ed113”:
var rgb = '30,209,19';
var hex = _.reduce(rgb.split(','), function(hexAccumulator, rgbValue) {
var intColor = _.parseInt(rgbValue);
if (_.isNaN(intColor)) {
throw new Error('The value ' + rgbValue + ' was not able to be converted to int');
}
// Ensure a value such as 2 is converted to "02".
var hexColor = _.padLeft(intColor.toString(16), 2, '0');
return hexAccumulator + hexColor;
}, '#');
这个代码片段将十六进制转换为rgb, rgb转换为十六进制。
视图演示
function hexToRgb(str) {
if ( /^#([0-9a-f]{3}|[0-9a-f]{6})$/ig.test(str) ) {
var hex = str.substr(1);
hex = hex.length == 3 ? hex.replace(/(.)/g, '$1$1') : hex;
var rgb = parseInt(hex, 16);
return 'rgb(' + [(rgb >> 16) & 255, (rgb >> 8) & 255, rgb & 255].join(',') + ')';
}
return false;
}
function rgbToHex(red, green, blue) {
var out = '#';
for (var i = 0; i < 3; ++i) {
var n = typeof arguments[i] == 'number' ? arguments[i] : parseInt(arguments[i]);
if (isNaN(n) || n < 0 || n > 255) {
return false;
}
out += (n < 16 ? '0' : '') + n.toString(16);
}
return out
}
我为RGB和十六进制颜色做了一个小的Javascript颜色类，这个类还包括RGB和十六进制验证函数。我将代码作为一个片段添加到这个答案中。
var colorClass = function() { this.validateRgb = function(color) { return typeof color === 'object' && color.length === 3 && Math.min.apply(null, color) >= 0 && Math.max.apply(null, color) <= 255; }; this.validateHex = function(color) { return color.match(/^\#?(([0-9a-f]{3}){1,2})$/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
我遇到了这个问题，因为我想要解析任何颜色字符串值，并能够指定不透明度，所以我写了这个使用canvas API的函数。
var toRGBA = function () {
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
canvas.width = 1;
canvas.height = 1;
return function (color) {
context.fillStyle = color;
context.fillRect(0, 0, 1, 1);
var data = context.getImageData(0, 0, 1, 1).data;
return {
r: data[0],
g: data[1],
b: data[2],
a: data[3]
};
};
}();
关于context.fillStyle注意:
如果解析值导致失败，则必须忽略该值，属性必须保留其先前的值。
下面是一个你可以用来测试输入的Stack Snippet演示:
var toRGBA = function () { var canvas = document.createElement('canvas'); var context = canvas.getContext('2d'); canvas.width = 1; canvas.height = 1; return function (color) { context.fillStyle = color; context.fillRect(0, 0, 1, 1); var data = context.getImageData(0, 0, 1, 1).data; return { r: data[0], g: data[1], b: data[2], a: data[3] }; }; }(); var inputs = document.getElementsByTagName('input'); function setColor() { inputs[1].value = JSON.stringify(toRGBA(inputs[0].value)); document.body.style.backgroundColor = inputs[0].value; } inputs[0].addEventListener('input', setColor); setColor(); input { width: 200px; margin: 0.5rem; } <input value="cyan" /> <input readonly="readonly" />
对于直接从jQuery转换，您可以尝试:
function rgbToHex(color) {
var bg = color.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(bg[1]) + hex(bg[2]) + hex(bg[3]);
}
rgbToHex($('.col-tab-bar .col-tab span').css('color'))
