js 颜色16进制转RGB方法

//颜色16进制转RGB方法
String.prototype.colorRgb = function(){
    var sColor = this.toLowerCase();
    //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})$/;
    // 如果是16进制颜色
    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 "[" + sColorChange.join(",") + ",0.6]";
    }
    return sColor;
};

 

colorRgba(sHex, alpha = 1) {
      var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
      let sColor = sHex.toLowerCase();
      if (sColor && reg.test(sColor)) {
        if (sColor.length === 4) {
          var sColorNew = '#';
          for (let i = 1; i < 4; i += 1) {
            sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1));
          }
          sColor = sColorNew;
        }
        var sColorChange = [];
        for (let i = 1; i < 7; i += 2) {
          sColorChange.push(parseInt('0x' + sColor.slice(i, i + 2)));
        }
        return 'rgba(' + sColorChange.join(',') + ',' + alpha + ')';
      } else {
        return sColor;
      }
    },