javascript實作十六進位顏色值（HEX）與RGB格式相互轉換_javascript技巧

在日常開發中，常會用到不同格式的顏色域值之間的相互轉換，以下給出一種解決方法。

複製程式碼 程式碼如下:

//十六進位顏色值的正規表示式
var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
/*RGB顏色轉換為16進位*/
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).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                 numHex = (aNum aNum);
            }
            return numHex;
        }
    }else{
        return that;       
    }};
 /*16進位顏色轉為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                     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             sColorChange.push(parseInt("0x" sColor.slice(i,i 2)));       
        }
        return "RGB(" sColorChange.join(",") ")";
    }else{
        return sColor;       
    }};

使用顏色轉換法：

複製程式碼 程式碼如下:

ar sRgb = "RGB(23, 245, 56)" , sHex = "#34538b";
var sHexColor = sRgb.colorHex();
var sRgbColor = sHex.colorRgb();