RGB颜色值转HTML十六进制(HEX)代码的JS函数

        function RGBToHex(rgb) {
            var regexp = /^rgb\(([0-9]{0,3})\,\s*([0-9]{0,3})\,\s*([0-9]{0,3})\)/g;
            var re = rgb.replace(regexp, "$1 $2 $3").split(" "); //利用正则表达式去掉多余的部分 
            var hexColor = "#"; var hex = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
            for (var i = 0; i < 3; i++) {
                var r = null; var c = re[i];
                var hexAr = [];
                while (c > 16) {
                    r = c % 16;
                    c = (c / 16) >> 0;
                    hexAr.push(hex[r]);
                } hexAr.push(hex[c]);
                hexColor += hexAr.reverse().join('');
            }
            return hexColor;
        }