title: Custom Map ,there is no latLng ,how to add marker?
body: <p>$(function(){
            var map,
                markerIndex = 0,
                markersCoords = {};</p>
  
  <pre><code>      map = new jvm.WorldMap({
            map: 'jilin',
            markerStyle: {
              initial: {
                fill: 'red'
              }
            },
            container: $('#world-map-gdp')
        });
  
        map.container.click(function(e){
            var latLng = map.pointToLatLng(e.offsetX, e.offsetY);
          alert(latLng);
  
        });
        $('.jvectormap-zoomin').click(); //放大  
      });
  </code></pre>
  
  <p>I use svg produced a Jilin Province Map of China.
  I want to add several markers in the map
  But I can not get latLng ，And I don't know why ? 
  Help!</p>