题解 | #颜色字符串转换#

function rgb2hex(sRGB) {
        console.log('sRGB',typeof sRGB);
        if(!sRGB) return;
        let colorNums = sRGB.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
        if(!colorNums) return sRGB;
        let [str, red, green, blue] = colorNums;        
        return "#" + [red, green, blue].map(item =>                 ((Number(item).toString(16))).padStart(2, '0')).join("");
    }