WebGIS学习，入门往往之最困难的，特别是地理信息专业的同学，课程与工作的脱钩，带来迷茫，一旦入门之后，然后就是星辰大海。学习是为了有选择工作的权力！而不仅仅是为了选择。
http://www.zgeo.work/api/arcgis_js_api/3.37/esri/css/esri.css
http://www.zgeo.work/api/arcgis_js_api/3.37/init.js
http://www.zgeo.work/api/arcgis_js_api/4.20/esri/themes/light/main.css
http://www.zgeo.work/api/arcgis_js_api/4.20/init.js
https://www.zgeo.work/api/cesium/Widgets/widgets.css
http://www.zgeo.work/api/cesium/Cesium.js
http://www.zgeo.work/api/openlayers/ol.css
http://www.zgeo.work/api/openlayers/ol.js
http://www.zgeo.work/api/leaflet/leaflet.css
http://www.zgeo.work/api/leaflet/leaflet.js
http://www.zgeo.work/api/mapbox-gl/mapbox-gl.css
http://www.zgeo.work/api/mapbox-gl/mapbox-gl.js
http://www.zgeo.work/api/threejs/three.js
http://www.zgeo.work/api/threejs/three.min.js
