Changing URL without refresh?

Question

I found an app on the internet inside of which, when you click A link it will redirect to A page without refreshing the whole place and changing the url address bar, I know

Answer 1

The simplest solution is to use a frame or iframe and set the target attribute of the a to the frame (or just click a link within a frame). This will show the new page within the frame and with the frameset-html's address in the location bar.