Posted in Javascript onJune 20, 2014
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<aColor.length; 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<aNum.length; i+=1){ 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<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; }};
使用颜色转换方法:
ar sRgb = "RGB(23, 245, 56)" , sHex = "#34538b"; var sHexColor = sRgb.colorHex(); var sRgbColor = sHex.colorRgb();
javascript实现十六进制颜色值(HEX)和RGB格式相互转换
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junjie声明:登载此文出于传递更多信息之目的,并不意味着赞同其观点或证实其描述。
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