javascript rgb to hex

function hexToRgb(hex){
	var result = /^#?([a-f\d]{2}])([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  	
 	return result ? {
    	r: parseInt(result[1],  16);
      	g: parseInt(result[2],  16);
  		b: parseInt(result[3],  16);
    } : null;
}
var hex = "#0a3678";
console.log(hexToRgb(hex).r+","+hexToRgb(hex).g+","+hexToRgb(hex).b);//10,54,120

function hexToRgb(hex) {
  // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
  var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
  hex = hex.replace(shorthandRegex, function(m, r, g, b) {
    return r + r + g + g + b + b;
  });

  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  return result ? [
    parseInt(result[1], 16),
    parseInt(result[2], 16),
    parseInt(result[3], 16)
  ] : null;
}

alert(hexToRgb("#0033ff").g); // "51";
alert(hexToRgb("#03f").g); // "51";