Why mapcentercoord not display value?

I use the plugin L. Control. Mapcentercoord in the leaflet map but when i use "L.control.mapCenterCoord({ latLngFormatter: function (lat, lng) { //calculate the geo hash (to show combining lat and long); display it as a link (to show how to customise the display) var geohash = encodeGeoHash(lat, lng); return '' + geohash + '' }, onMove: true }).addTo(map);" value in return is not recorded in the folder. I should be able to click on lat,lng. All browsers are already tried but still the same problem. Can anyone help