leaflet-geojson 显示点

addTreesLayer: function() {
        var that = this;
        //先定义点的样式
        var geojsonMarkerOptions = {
            radius: 1,
            fillColor: "#ff7800",
            color: "blue",
            weight: 1,
            opacity: 1,
            fillOpacity: 0.6
        };

        var layer = L.geoJson(treesGEOJSON, {
          pointToLayer: function (feature, latlng) {
              return L.circleMarker(latlng, geojsonMarkerOptions);
          }
        }).addTo(that.map);
        that.layerControl.addOverlay(layer, '果树');
    }
addTreesLayer();