Javascript实现颜色rgb与16进制转换的方法

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);  }});