使用划线或圆点样式设置Google Maps v3折线的样式？

var lineCoordinates = [
  new google.maps.LatLng(22.291, 153.027),
  new google.maps.LatLng(18.291, 153.027)
];

var lineSymbol = {
  path: \'M 0,-1 0,1\',
  strokeOpacity: 1,
  scale: 4
};

var line = new google.maps.Polyline({
  path: lineCoordinates,
  strokeOpacity: 0,
  icons: [{
    icon: lineSymbol,
    offset: \'0\',
    repeat: \'20px\'
  }],
  map: map
});

path