js 顏色16進位轉RGB方法

//顏色16進位轉RGB方法
String.prototype.colorRgb = function(){
    var sColor = this.toLowerCase();
    //十六進位顏色值的正則表達式
    var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
    // 如果是16進位顏色
    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 "[" + sColorChange.join(",") + ",0.6]";
    }
    return sColor;
};