javascript - Openlayers OSM 始终设置为 (long/lat) (0/0)

Question

这是我的代码

map = new OpenLayers.Map("map");    
// I tried several projections here, all lead to the same result
var proj = new OpenLayers.Projection("WGS84");
var point = new OpenLayers.LonLat(position.coords.latitude,position.coords.longitude);
point.transform(proj, map.getProjectionObject());
    
// the output of this shows the correct coordinates
console.log("latitude: "+position.coords.latitude+"  long "+position.coords.longitude);
    
var mapnik = new OpenLayers.Layer.OSM();
map.addLayer(mapnik);
map.setCenter(point,3);

它始终显示以大西洋某处坐标 (0/0) 为中心的 map 。我的错误在哪里？我无法解决这个问题，但在 Google 上什么也找不到。

然而，这是可行的。

map = new OpenLayers.Map( 'map');
layer = new OpenLayers.Layer.OSM( "Simple OSM Map");
map.addLayer(layer);
map.setCenter(
  new OpenLayers.LonLat(position.coords.latitude,position.coords.longitude).transform(
  new OpenLayers.Projection("EPSG:4326"),
  map.getProjectionObject()
  ), 12
); 

Answer 1

如果您尝试了多个投影并且都导致了相同的结果，那可能是因为 Proj4js 没有正确加载(参见 http://trac.osgeo.org/openlayers/wiki/Documentation/Dev/proj4js)

同时检查这个例子:http://openlayers.org/dev/examples/osm.html (坐标从 EPSG 重新投影:4326)