//转换css中常用颜色编码

var toRGB = function (val){
    var reg1 = /^#([0-9A-F]{2})([0-9A-F]{2})([0-9A-F]{2})$/i; //i不区分大小写
     var reg2 = /^#([0-9A-F])([0-9A-F])([0-9A-F])$/i;
     var reg3 = /[0-9A-F]{2}/g,//发现第一个匹配项即停止
         m;

         if(reg2.test(val)){
             val = val.replace(reg2,"#$1$1$2$2$3$3");
         }else if(reg1.test(val)){
             m = val.match(reg3);
             val = "rgb("+[parseInt(m[0],16),parseInt(m[1],16),parseInt(m[2],16),].join(‘,‘)+")";
         }

         return val;
};
document.write(toRGB("#0000ff"));