Javascript实现颜色rgb与16进制转换的方法_javascript技巧

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); } });