十六进制到RGB或RGBA半透明

Posted 2021-02-25

Transform a color given in hex to RGB. An optional opacity argument also enables RBGA.

function hex2rgb(hex, opacity) {
  var rgb = hex.replace('#', '').match(/(.{2})/g);
 
  var i = 3;
  while (i--) {
    rgb[i] = parseInt(rgb[i], 16);
  }
 
  if (typeof opacity == 'undefined') {
    return 'rgb(' + rgb.join(', ') + ')';
  }
 
  return 'rgba(' + rgb.join(', ') + ', ' + opacity + ')';
};