相关疑难解决方法(0)

var map = null;
var marker;

function showlocation() {
  // One-shot position request.
  navigator.geolocation.getCurrentPosition(callback);
}
 
function callback(position) {

  if (marker != null) {
    marker.setMap(null);
  }

  var geocoder = new google.maps.Geocoder();
  var lat = position.coords.latitude;
  var lon = position.coords.longitude;
  document.getElementById('default_latitude').value = lat;
  document.getElementById('default_longitude').value = lon;
  var latLong = new google.maps.LatLng(lat, lon);
  marker = new google.maps.Marker({
    position: latLong,
    draggable: true
  });
  marker.setMap(map);
  map.setZoom(16);
  map.setCenter(marker.getPosition());

  google.maps.event.addListener(marker, 'dragend', function() {
    geocoder.geocode({
      'latLng': marker.getPosition()
    }, function(results, status) {
      if (status …