Does Javascript have anything similar to VBA's DoEvents?

If your application really requires long-running JavaScript code, one of the best ways to deal with it is by using JavaScript web workers. JavaScript code normally runs on the foreground thread, but by creating a web worker you can effectively keep a long-running process on a background thread, and your UI thread will be free to respond to user input.

As an example, you create a new worker like this:

var myWorker = new Worker("worker.js");

You can then post messages to it from the js in the main page like this:

myWorker.postMessage([first.value,second.value]);console.log('Message posted to worker');

And respond to the messages in worker.js like this:

onmessage = function(e) {  console.log('Message received from main script');  var workerResult = 'Result: ' + (e.data[0] * e.data[1]);  console.log('Posting message back to main script');  postMessage(workerResult);}

With the introduction of generators in ES6, you can write a helper method that uses yield to emulate DoEvents without much syntactic overhead:

doEventsOnYield(function*() {    ... synchronous stuff ...    yield;  // Pump the event loop. DoEvents() equivalent.    ... synchronous stuff ...});

Here's the helper method, which also exposes the completion/failure of the function as a Promise:

function doEventsOnYield(generator) {    return new Promise((resolve, reject) => {        let g = generator();        let advance = () => {            try {                let r = g.next();                if (r.done) resolve();            } catch (ex) {                reject(ex);            }            setTimeout(advance, 0);        };        advance();    });}

Note that, at this time, you probably need to run this through an ES6-to-ES5 transpiler for it to run on common browsers.

You can use the setTimeout:

setTimeout(function() { }, 3600);

3600 it's the time in milliseconds:

http://www.w3schools.com/jsref/met_win_settimeout.asp