Javascript realizes mutual conversion between hexadecimal color value (HEX) and RGB format_javascript skills

In daily development, conversion between color range values ​​in different formats is often used. A solution is given below.

Copy code The code is as follows:

//Regular expression for hexadecimal color value
var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
/*Convert RGB color to hexadecimal*/
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;                             }};
/*Convert hexadecimal color to RGB format*/
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;
}
//Processing six-digit color values
        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;                                                     }};


Use color conversion method:

Copy code

The code is as follows:

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