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我一直在尝试将地址地理编码为 LatLng 坐标,但这样做有很多困难。我知道geocode()是一个异步函数,我一直在玩弄回调无济于事。我一直在看类似这样的其他帖子(如何从异步回调函数返回值?),但我很难理解这个概念。如果有人能告诉我如何正确地执行该回调函数,将不胜感激。很头疼这个。能够让回调执行alert()提供正确 LatLng 的操作,但未设置位置参数。抱歉,无法从前面引用的示例中弄清楚。语言很新。您可以指出我理解这个概念的任何参考资料也非常感谢。谢谢!

  var location;
  var image;
  var map;
  var geocoder;
  var address;

  function initialize() {
    var mapOptions = {
      center: new google.maps.LatLng(42.763146, -73.3776),
      zoom: 6,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),
        mapOptions);
    var cloudLayer = new google.maps.weather.CloudLayer();
    cloudLayer.setMap(map);

    addressSet(function(address) {
        console.log(address);
        // tried to set location = address;, location = new google.maps.LatLng(address);
        // neither works
    });

    addMtsToMap(location,
                map,
                new google.maps.MarkerImage("img/mts/skier.png", null, null, null, new google.maps.Size(50,50)));

  }

  function addMtsToMap(location, map, image) {

    var marker = new google.maps.Marker({
        position: location,
        map: map,
        icon: image
    });

    var infoWindow = new google.maps.InfoWindow({content: "<h1>Powder!!!</h1>"});

    google.maps.event.addListener(marker, "click", function() {
        infoWindow.open(map, marker);
    });
  }

  function addressSet(callback) {

    geocoder = new google.maps.Geocoder();

    geocoder.geocode({address: "Killington+VT"}, function(results, status) {

        if (status == google.maps.GeocoderStatus.OK) {

            address = results[0].geometry.location;
            callback(address);
        }
    });
  }
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1 回答 1

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对不起大家。无法相信我在搞砸了这么久之后发现了什么。我var map在初始化中再次声明,这使我的addressSet()函数拉取了不正确的全局映射变量。删除 var 使其工作。

于 2013-02-13T18:48:12.567 回答