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class Db{ openDB(){ } getByIndex: async function (table, keyValue, indexCursor) { try { let db = await this.openDB(); let store = db .transaction(table.name, 'readonly') .objectStore(table.name); let keyRng = IDBKeyRange.only(keyValue); let request = store.index(indexCursor).openCursor(keyRng); let data = []; return new Promise(resolve => { request.onerror =reject; request.onsuccess = function (event) { var cursor = event.target.result; if (cursor) { console.log(cursor.value); data.push(cursor.value); cursor.continue(); } }; resolve(data); }) } catch (error) { return Promise.reject(error); } } }