javascript实现十六进制颜色值（HEX）和RGB格式相互转换_javascript技巧

在日常开发中，经常会用到不同格式的颜色域值之间的相互转换，以下给出一种解决方法。

//十六进制颜色值的正则表达式
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).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进制颜色转为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;
}
//处理六位的颜色值
var sColorChange = [];
for(var i=1; i sColorChange.push(parseInt("0x"+sColor.slice(i,i+2)));
}
return "RGB(" + sColorChange.join(",") + ")";
}else{
return sColor;
}};

使用颜色转换方法：

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