GPS

通过地图经纬度得到地理信息
function initialize() {
  map = new GMap2(document.getElementById("map"));
  map.setCenter(new GLatLng(39.90822, 116.4055), 13);
  map.addControl(new GLargeMapControl);
  GEvent.addListener(map, "click", getAddress);
  geocoder = new GClientGeocoder();
}
function getAddress(marker, point,msg) {//通过经纬度得到一个地理位置
if (point != null) {
geocoder.getLocations(point, function(response){
  map.clearOverlays();
  if (!response || response.Status.code != 200) {
alert("Status Code:" + response.Status.code);
  } else {
place = response.Placemark[0];
point = new GLatLng(place.Point.coordinates[1],place.Point.coordinates[0]);
marker = new GMarker(point);
map.addOverlay(marker);
marker.openInfoWindowHtml(
'<b>经纬度:</b>' + response.name + '<br/>' + 
'<b>地理位置:</b>' + place.address + '<br>'+
'<b>警报信息:</b>'+msg);
  }
});
  }
主要是GClientGeocoder这个类的getLocations这个方法通过一个GLatLng得到response信息，然后在进行解析就可以了！

{
  "name": "1600 Amphitheatre Parkway, Mountain View, CA, USA",
  "Status": {
    "code": 200,
    "request": "geocode"
  },
  "Placemark": [
    {
      "address": "1600 Amphitheatre Pkwy, Mountain View, CA 94043, USA",
      "AddressDetails": {
        "Country": {
          "CountryNameCode": "US",
          "AdministrativeArea": {
            "AdministrativeAreaName": "CA",
            "SubAdministrativeArea": {
              "SubAdministrativeAreaName": "Santa Clara",
              "Locality": {
                "LocalityName": "Mountain View",
                "Thoroughfare": {
                  "ThoroughfareName": "1600 Amphitheatre Pkwy"
                },
                "PostalCode": {
                  "PostalCodeNumber": "94043"
                }
              }
            }
          }
        },
        "Accuracy": 8
      },
      "Point": {
        "coordinates": [-122.083739, 37.423021, 0]
      }
    }
  ]
}