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function fakeAjax(url, cb) {
	var fake_responses = {
		file1: 'The first text',
		file2: 'The middle text',
		file3: 'The last text'
	};
	var randomDelay = (Math.round(Math.random() * 1e4) % 8000) + 1000;

	console.log('Requesting: ' + url);

	setTimeout(function() {
		cb(fake_responses[url]);
	}, randomDelay);
}

function output(text) {
	console.log(text);
}

function getFile(file) {
	return new Promise(function(resolve, reject) {
		fakeAjax(file, resolve);
	});
}

var p1 = getFile('file1');
var p2 = getFile('file2');
var p3 = getFile('file3');

p1.then(output)
	.then(() => p2)
	.then(output)
	.then(() => p3)
	.then(output)
	.then(() => output('Complete!'));