题解 | #颜色字符串转换#

    function rgb2hex(sRGB) {
		 // 填写JavaScript
        const reg = /\d+/g
        const arr = sRGB.match(reg)
        return arr? arr.reduce((pre,cur)=> {
            let hex = (cur*1).toString(16)
            hex =  hex.length > 1 ? hex : '0'+ hex
            return pre + hex
        },'#') : sRGB
	}