Persistence In A JavaScript Module

I need to write a JavaScript module that rotates banner images displayed in a SharePoint web part. I would like to rely on SharePoint APIs as little as possible, and keep as much a

Solution 1:

There are a few ways. But, for something like this, I would go with localStorage. For instance:

localStorage.setItem('lastSlide', JSON.stringify({
  time: +new Date,
  src: 'http://lorempixel.com/100/100'
}));

// Then, to retrieve:
var lastSlide;
try {
  lastSlide = JSON.parse(localStorage.getItem('lastSlide'));
} catch(e) { /* ... */}