使用Google Maps API V3,确定标记是否在KML图层边界内

function addMarker(marker) {
  var markerBounds = marker.getBounds();
  var markerLatlng = marker.getLatLng();
  var markerBoundsLatlng = {
    north: markerBounds.getNorth(),
    south: markerBounds.getSouth(),
    east: markerBounds.getEast(),
    west: markerBounds.getWest()
  };

  var markerInsideBounds = false;
  for (var i = 0; i < markers.length; i++) {
    var markerLatlngInsideBounds = {
      north: markers[i].getBounds().getNorth(),
      south: markers[i].getBounds().getSouth(),
      east: markers[i].getBounds().getEast(),
      west: markers[i].getBounds().getWest()
    };

    if (markerInsideBounds) {
      if (markerLatlngInsideBounds.south < markerLatlng.lat) {
        markerInsideBounds = false;
      } else if (markerLatlngInsideBounds.north > markerLatlng.lat) {
        markerInsideBounds = false;
      } else if (markerLatlngInsideBounds.west < markerLatlng.lng) {
        markerInsideBounds = false;
      } else if (markerLatlngInsideBounds.east > markerLatlng.lng) {
        markerInsideBounds = false;
      }
    }
  }

  if (!markerInsideBounds) {
    markers.push(marker);
  }
}