fix: 完善单测demo(indexedDB相关)

src/indexedDB/index.js

@@ -1,8 +1,19 @@
 import { dbName, dbGeoDataTableName, dbDrilldownTableConfig } from '@/utils/constants'
 import Dexie from 'dexie'
+/* https://dexie.org/ */
 
-export const db = new Dexie(dbName)
-db.version(2).stores({
+const db = new Dexie(dbName)
+db.version(3).stores({
   [dbGeoDataTableName]: '++name, geo',
-  [dbDrilldownTableConfig]: '++id, config'
+  [dbDrilldownTableConfig]: '++id, config',
+  test: '++id, name'
 })
+function selectTable (tableName) {
+  return db[tableName]
+}
+
+const indexedDBUtils = {
+  db,
+  selectTable
+}
+export default indexedDBUtils