javascript random color generator

function generateRandomColor() {
  var letters = '0123456789ABCDEF';
  var color = '#';
  for (var i = 0; i < 6; i++) {
    color += letters[Math.floor(Math.random() * 16)];
  }
  return color;
}

var randomColor=generateRandomColor();//"#F10531"'#'+(0x1000000+(Math.random())*0xffffff).toString(16).substr(1,6)