const rgb2Hex = (r, g, b) => {
r = Math.max(Math.min(Number(r), 100), 0) * 2.55
g = Math.max(Math.min(Number(g), 100), 0) * 2.55
b = Math.max(Math.min(Number(b), 100), 0) * 2.55
r = ('0' + (Math.round(r) || 0).toString(16)).slice(-2)
g = ('0' + (Math.round(g) || 0).toString(16)).slice(-2)
b = ('0' + (Math.round(b) || 0).toString(16)).slice(-2)
return '#' + r + g + b
}
rgb2Hex(100, 50, 0) // "#ff7f00"
https://blog.csdn.net/weixin_43837268/article/details/99686183
