1.rgb转16进制
function to16 (a) {//RGB(204,204,024)
//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})$/;
var that = a;
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[i]).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[i] + aNum[i]);
}
return numHex;
}
} else {
return that;
}
}
2.16进制转rgb
function torgb(a) {//#ffffff
//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})$/;
var sColor =
a.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;
}
//处理六位的颜色值
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;
}
}