Redirect to random link on the same website (JavaScript)

When website.com/api is loaded, it want it to redirect me to http://ift.tt/2pSYZ24.

I want to do this with JavaScript or PHP.

So then i need something to keep track of the random_images, and i need something to redirect me to a random image.

(This is my first post here on StackOwerflow, sorry if it was difficult to understand!)