All you have to do is…
- Save your value to the wix-storage before you leave your current page (like Anthony already mentioned the “Session-storage”. The same way you could also use “local” instead.
- Then you navigate relaxed to the next page.
- On the following page you just have to load the value ($w.onLoad) from the wix storage, which you have saved before.
Et voilà! You have changed the page and you have still your value.