通过GMarker 标注地图上的位置。它实现 GOverlay 接口，因此用 GMap2.addOverlay() 方法添加到地图中。
其方法getPoint()可返回此标记锚定的地理坐标,返回值类型GLatLng
GEvent.addListener(gmapGoogleMap, 'click', mapClick);
function mapClick(marker, point) {
centerMarker = createMarker(point)
gmapGoogleMap.addOverlay(centerMarker);
centerMarker.openInfoWindowHtml(getMarkerText(centerMarker));
}
function createMarker(point, title) {
var cimage = "images/red-dot.png";
var icon = new GIcon();
icon.image = cimage;
icon.iconSize = new GSize(32, 32);
icon.iconAnchor = new GPoint(14, 32);
icon.infoWindowAnchor = new GPoint(14,0);
var cMarker = new GMarker(point,{icon:icon,draggable:true});
GEvent.addListener(cMarker, "click", function() {
cMarker.openInfoWindowHtml(getMarkerText(cMarker));
});
return cMarker;
}
function getMarkerText(cMarker){
return cMarker.getPoint()
}
