Put markers to a map generated with topoJSON and d3.js
问题 I am creating a map of a particular state, I have been experimenting with d3.js and topojson and have created a great map, but now I want to add a marker on the map. But now I have problems because as I add the marker have a GeoJSON file to add markers to the map generated and also the power I'd like to open a tooltip whenever a marker is pressed. My map is very similar to this: http://bl.ocks.org/mbostock/4699541 and all I want is to add markers to states through a GeoJSON file that has the