今天绵阳动力网络公司为大家介绍：Javascript实现颜色rgb与16进制转换的方法,实例分析了颜色值转换的常用技巧与使用方法,非常具有实用价值,需要的朋友可以参考下：

使用方法：

Color(12,34,56); 
Color("#fff") Color("#defdcd") 

实现代码：

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);
   }
 });