mv

index.js

@@ -0,0 +1,31 @@
+
+const request = require('request');
+const regression = require('regression');
+
+const old_url = 'https://gisanddata.maps.arcgis.com/sharing/rest/content/items/bda7594740fd40299423467b48e9ecf6/data?f=json';
+const base_url = "https://services1.arcgis.com/0MSEUqKaxRlEPj5g/arcgis/rest/services/cases_time/FeatureServer/0/query?f=json";
+const date_arg = "&where=Report_Date%3C%3D%272020-02-02 22:59:59%27";
+const more_arg = "&returnGeometry=false&spatialRel=esriSpatialRelIntersects&outFields=*&orderByFields=Report_Date%20asc&resultOffset=0&resultRecordCount=2000&cacheHint=true";
+
+
+module.exports = function(){
+	return new Promise((resolve, reject)=>{
+
+		request(base_url + date_arg + more_arg, function (error, response, body) {
+		  if(response.statusCode == 200){
+		  	const cnt = JSON.parse(body);
+		  	//console.log('body:',cnt.features); // Print the HTML for the Google homepage.
+		  	var data = [[0,0]];
+		  	for (var dp of cnt.features) {
+		  		if(dp.attributes.Total_Confirmed != null){
+			  		data.push([dp.attributes.ObjectId, dp.attributes.Total_Confirmed]);
+		  		}
+		  	}
+		  	var cur_result = regression.polynomial(data, { order: 3 });
+		  	resolve(cur_result.predict(cnt.features.length))
+		  }else{
+		  	reject(error);
+		  }
+		});
+	});
+}