问谷歌地图标记未出现

EN

  function initialize() {

    var mapOptions = {
      center: new google.maps.LatLng(-34.397, 150.644),
      zoom: 2
    };

    var map = new google.maps.Map($('#maptest')[0], mapOptions);

    $.getJSON("/parks.json", function(parks) {
      $.each(parks, function(key, park) {
        if (park.lat && park.lng) {
          var latlng = park.lat + ',' + park.lng;
          var location = new google.maps.LatLng(latlng);
          var marker = new google.maps.Marker({
            position: location,
            map: map
          });
          console.log('Added map marker for ' + park.name + ' at ' + park.lat + ', ' + park.lng);
        }
      });
    });
  }

  google.maps.event.addDomListener(window, 'load', initialize);