function rgb2hex(sRGB) {
    const rgb=sRGB.match(/\d+/g)
    if(!rgb||rgb.length!=3){
        return sRGB
    }
    let res='#'
    rgb.forEach((el)=>{
        const p= parseInt(el).toString(16,2)
        res+=p.length==2?p:'0'+p
    })
    return res
}