db.class.js

// This works on all devices/browsers, and uses IndexedDBShim as a final fallback 
var indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB || window.shimIndexedDB;

// Open (or create) the database
var open = indexedDB.open("WeTrust", 1);

// Create the schema
open.onupgradeneeded = function() {
    var db = open.result;
    var store = db.createObjectStore("tpoExamen", { keyPath: "id",autoIncrement: 'true' });
    var index = store.createIndex("nombre", "nombre", { unique: true });
};

open.onsuccess = function() {
    // Start a new transaction
    var db = open.result;
    var tx = db.transaction("tpoExamen", "readwrite");
    var store = tx.objectStore("tpoExamen");
    var index = store.index("nombre");

    // Add some data
    store.put({id: 1, name: "John"});
    store.put({id: 2, name: "Bob"});
    
    // Query the data
    var getJohn = store.getAll();

    getJohn.onsuccess = function() {
        for (i = 0; i < getJohn.result.length; i++) { 
            console.log(getJohn.result[i].name);
        }
    };


    // Close the db when the transaction is done
    tx.oncomplete = function() {
        db.close();
    };
}

async function loadTpoExamen(){
    // Start a new transaction
    var db = await open.result;
    var tx = await db.transaction("tpoExamen", "readwrite");
    var store = await tx.objectStore("tpoExamen");
    var index = await store.index("nombre");
    
    // Query the data
    var getJohn = await store.getAll();

    getJohn.onsuccess = function() {
        return getJohn.result;
    };


    // Close the db when the transaction is done
    tx.oncomplete = function() {
        db.close();
    };
}


async function añadir2(x) {
  var a = await resolverDespuesDe2Segundos(20);
  var b = await resolverDespuesDe2Segundos(30);
  return x + a + b;
}