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 颜色转换，RGB颜色转换为16进制,16进制颜色转为RGB格式，可以自己设置透明度。

//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 < 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;}
};
/*16进制颜色转为RGB格式*/
String.prototype.colorRgb = function (opacity) {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;}//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 "rgba(" + sColorChange.join(",") + "," + opacity + ")";} else {return sColor;}
};//调用方法：
"#f00".colorHex()  //'#ff0000'
'#f00'.colorRgb(0); //'rgba(255,0,0,0)'