doc: add fetchChinaData and fetchWorldData method

controller/ncovFetchData.js

@@ -1,5 +1,7 @@
 // 导入models文件
 import ncovChinaData from "../models/ncovChinaData.js";
+import ChinaNcovData from '../models/ChinaData.js';
+import WorldNcovData from "../models/WorldData.js";
 
 // Fetch China Data method
 export const fetchAllChinaData = (req, res) => {
@@ -17,4 +19,22 @@ export const fetchIndividualChinaData = (req, res) => {
     }).catch(error => {
         res.status(404).json({message: error});
     })
-}
+}
+
+// Fetch China Data from Wapi
+export const fetchChinaData = async (req, res) => {
+    ChinaNcovData.find().then(result => {
+        res.send(result);
+    }).catch(error => {
+        res.status(404).json({message: error});
+    })
+};
+
+// Fetch World Dta from Wapi
+export const fetchWorldData = (req, res) => {
+    WorldNcovData.find().then(result => {
+        res.send(result);
+    }).catch(error => {
+        res.status(404).json({ message: error });
+    });
+};