問: .Net Core: Application startup exception: System.IO.FileNotFoundException: The configuration file 'appsettings.json' was not found and is not optional. 答: 問題代碼: public Startup() { var builder = new ConfigurationBu
直接上代码:var vector = new ol.layer.Vector({source: new ol.source.Vector({url: './data/geojson/countries.geojson',format: new ol.format.GeoJSON()})}); map.addLayer(vector); 转载于:https://www.cnblogs.com/marost/p/7352531.html