十六进制颜色值与RGB(A)颜色值互相转换。

export function rgbToHex(val) { 
                  var r, g, b, a,             regRgba = /rgba?\((\d{1,3}),(\d{1,3}),(\d(1，3)(([.\d] ))?\)/,                 //判断rgb颜色值格式的正则表达式，如rgba(255,20,10,.54)             rsa = val.replace(/\s /g, '').match(regRgba);         if (!!rsa) { 
                     r = parseInt(rsa[1]).toString(16);             r = r.length == 1 ? '0'   r : r;             g = ( rsa[2]).toString(16);             g = g.length == 1 ? '0'   g : g;             b = ( rsa[3]).toString(16);             b = b.length == 1 ? '0' + b : b; a = (+(rsa[5] ? rsa[5] : 1)) * 100; return { 
          hex: '#' + r + g + b, r: parseInt(r, 16), g: parseInt(g, 16), b: parseInt(b, 16), alpha: Math.ceil(a) }; } else { 
          return { 
          hex: '无效', alpha: 100 }; } } 

    export function hexToRgb (val) { 
           
        // 16进制颜色值的正则
        var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
        // 把颜色值变成小写
        var color = val.toLowerCase();
        var result = '';
        if (reg.test(color)) { 
        
            // 如果只有三位的值，需变成六位，如：#fff => #ffffff
            if (color.length === 4) { 
        
                var colorNew = "#";
                for (var i = 1; i < 4; i += 1) { 
        
                    colorNew += color.slice(i, i + 1).concat(color.slice(i, i + 1));
                }
                color = colorNew;
            }
            // 处理六位的颜色值，转为RGB
            var colorChange = [];
            for (var i = 1; i < 7; i += 2) { 
        
                colorChange.push(parseInt("0x" + color.slice(i, i + 2)));
            }
            result = "rgb(" + colorChange.join(",") + ")";
            return { 
         rgb: result, r: colorChange[0], g: colorChange[1], b: colorChange[2] };
        } else { 
        
            result = '无效';
            return { 
         rgb: result };
        }

    }