javascript實(shí)現(xiàn)十六進(jìn)制顏色值（HEX）和RGB格式相互轉(zhuǎn)換

    這篇文章主要介紹了javascript實(shí)現(xiàn)十六進(jìn)制顏色值（HEX）和RGB格式之間的轉(zhuǎn)換,使用正則的方法實(shí)現(xiàn)RGB顏色轉(zhuǎn)換為16進(jìn)制,需要的朋友可以參考下。
    在日常開(kāi)發(fā)中，經(jīng)常會(huì)用到不同格式的顏色域值之間的相互轉(zhuǎn)換，以下給出一種解決方法。
    代碼如下:
    //十六進(jìn)制顏色值的正則表達(dá)式
    var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
    /*RGB顏色轉(zhuǎn)換為16進(jìn)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<aColor.length; i++){
                var hex = Number(aColor).toString(16);
                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<aNum.length; i+=1){
                    numHex += (aNum+aNum);
                }
                return numHex;
            }
        }else{
            return that;       
        }};
     /*16進(jìn)制顏色轉(zhuǎn)為RGB格式*/
     String.prototype.colorRgb = function(){
        var sColor = this.toLowerCase();
        if(sColor && reg.test(sColor)){
            if(sColor.length === 4){
                var sColorNew = "#";
                    for(var i=1; i<4; i+=1){
                        sColorNew += sColor.slice(i,i+1).concat(sColor.slice(i,i+1));       
                    }
                    sColor = sColorNew;
            }
            //處理六位的顏色值
            var sColorChange = [];
            for(var i=1; i<7; i+=2){
                sColorChange.push(parseInt("0x"+sColor.slice(i,i+2)));       
            }
            return "RGB(" + sColorChange.join(",") + ")";
        }else{
            return sColor;       
        }};
    使用顏色轉(zhuǎn)換方法：
    代碼如下:
    ar sRgb = "RGB(23, 245, 56)" , sHex = "#34538b";
    var sHexColor = sRgb.colorHex();
    var sRgbColor = sHex.colorRgb();