rgb与16进制的转换，javascript

var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
/*RGB颜色转换为16进制*/
String.prototype.colorHex = function(){
    var that = this;
    if(/^(rgb|RGB)/.test(that)){
        var aColor = that.replace(/(?:\(|\)|rgb|RGB)*/g,"").split(",");
        var strHex = "#";
        for(var i=0; i            var hex = Number(aColor[i]).toString(16);
            if (hex.length == 1) {
               hex = "0" + hex;
            } //问题出在这里
            if(hex === "0"){
                hex += hex;  
            }
            strHex += hex;
        }
        if(strHex.length !== 7){
            strHex = that;   
        }
        return strHex;
    }else if(reg.test(that)){
        var aNum = that.replace(/#/,"").split("");
        if(aNum.length === 6){
            return that;  
        }else if(aNum.length === 3){
            var numHex = "#";
            for(var i=0; i                numHex += (aNum[i]+aNum[i]);
            }
            return numHex;
        }
    }else{
        return that;  
    }
};

修改这里

//把16进制转为 10进制
parseInt('ff',16)

//把10进制数转为 16进制 字符串
(255).toString(16)
//左补0
var ss = (255).toString(16)

if (ss.length<=1){
ss = '0' + ss
}

你看看这个文章能不能明白《RGB色与Hex色互换代码》