我怎样才能在地图上显示值守位置?

我使用cordova来查找使用watchPosition()方法的设备位置。我能成功找回位置，但是我想将watchposition()的纬度和经度值传递给Google地图。我该怎么做呢?

index . html

<div id="map"></div>
<script>
  var map;
  function initMap() {
    var myLatLng = {
        //here the lat and lon should update on intervals
    };
    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 12,
      center: myLatLng
    });
    var marker = new google.maps.Marker({
      position: myLatLng,
      map: map,
      title: 'Hello World!'
    });
  }
</script>

app.js

$("#getGeolocation").on('click', function(){
        document.addEventListener("deviceready", onDeviceReady, false);
            function onDeviceReady() {          
               function onSuccess(position) {
                    var element = document.getElementById('geolocation');
                    element.innerHTML = 'Latitude: '  + position.coords.latitude      + '<br />' +
                                        'Longitude: ' + position.coords.longitude     + '<br />' +
                                        '<hr />'      + element.innerHTML;
                }
                function onError(error) {
                    alert('code: '    + error.code    + ''n' +
                          'message: ' + error.message + ''n');
                }
                var watchID = navigator.geolocation.watchPosition(onSuccess, onError, { timeout: 3000 });
        }
    });