Владислав Лысков

var osmUrl = 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
        osmAttrib = '&copy; <a href="http://openstreetmap.org/copyright">OpenStreetMap</a> contributors',
        osm = L.tileLayer(osmUrl, {maxZoom: 18, attribution: osmAttrib}),
        map = new L.Map('map', {center: new L.LatLng(40, -100), zoom: 7}),
        drawnItems = L.featureGroup().addTo(map);
        osm.addTo(map);