瓦片图层数据
            map.addLayer(new ol.layer.Tile({
                    title: "天地图矢量图层",
                    source: new ol.source.XYZ({
                        url: "http://t0.tianditu.com/DataServer?T=vec_w&x={x}&y={y}&l={z}&tk=" + tdk,
                        wrapX: false
                    })
            }));
            map.addLayer(new ol.layer.Tile({
                    title: "天地图矢量注记图层",
                    source: new ol.source.XYZ({
                  