Javascript 颜色转换rgb与16进制互转

颜色转换rgb与16进制互转
使用方法：
Color(12,34,56);
Color(“#fff”)
Color(“#defdcd”)

//颜色转换
			var Color = function() {
				if (!(this instanceof Color)) {
					var color = new Color();
					color._init.apply(color, arguments);
					return color;
				}
				if (arguments.length) {
					this._init.apply(this, arguments);
				}
			}
			//设置get，set方法
			var methods = ["red", "green", "blue", "colorValue"];
			var defineSetGetMethod = function(fn, methods) {
				var fnPrototype = fn.prototype;
				for (var i = 0; i < methods.length; i++) {
					var methodName = methods[i].charAt(0).toLocaleUpperCase() + methods[i].substring(1);
					fn.prototype['set' + methodName] = new Function("value", "this." + methods[i] + "= value;");
					fn.prototype['get' + methodName] = new Function("return this." + methods[i] + ";");
					fn.prototype['toString'] = new Function('return "rgb("+this.red+","+this.green+","+this.blue+")";');
				}
			};
			defineSetGetMethod(Color, methods);
			//扩展函数的实例方法
			var extend = function(fn, option) {
				var fnPrototype = fn.prototype;
				for (var i in option) {
					fnPrototype[i] = option[i];
				}
			};
			extend(Color, {
				_init : function() {
					if (arguments.length == 3) {
						this.red = arguments[0];
						this.green = arguments[1];
						this.blue = arguments[2];
						this.getColorValue();
					} else {
						var colorValue = arguments[0].replace(/^\#{1}/, "");
						if (colorValue.length == 3) {
							colorValue = colorValue.replace(/(.)/g, '$1$1');
						}
						this.red = parseInt('0x' + colorValue.substring(0, 2), 16);
						this.green = parseInt('0x' + colorValue.substring(2, 4), 16);
						this.blue = parseInt('0x' + colorValue.substring(4), 16);
						this.colorValue = "#" + colorValue;
					}
				},
				getColorValue : function() {
					if (this.colorValue) {
						return this.colorValue;
					}
					var hR = this.red.toString(16);
					var hG = this.green.toString(16);
					var hB = this.blue.toString(16);
					return this.colorValue = "#" + (this.red < 16 ? ("0" + hR) : hR) + (this.green < 16 ? ("0" + hG) : hG) + (this.blue < 16 ? ("0" + hB) : hB);
				}
			});