RGB转hex

var color = {r: 186, g: 218, b: 85};
function rgb2hex(r, g, b) {
     return '#' + ((1 << 24) + (r << 16) + (g << 8) + (b << 0)).toString(16).slice(1); 
}
rgb2hex(color.r, color.g, color.b);

hex 转RGB

var color = '#ccffcc';
function hex2rgb(color) {
     return {
       r: parseInt('0x' + color.slice(1, 3)),
    g:  parseInt('0x' + color.slice(3, 5)),
    b:  parseInt('0x' + color.slice(5, 7))
  }
}
hex2rgb(color);