History.go (-1), History.back (), Document.referrer difference

History.go (-1) Back to the previous page, the personal think is to walk the cache so the data is also saved.

History.back (-1) Return to the previous page, should go is the connection, the data does not exist, re-refresh the page.

Document.referrer the URL that returns to the previous page can be printed.

Alert (History.go ( -1));//undefined

Alert (History.back ( -1));//undefined

alert (document.referrer);//Return to previous page URL

History.go (-1), History.back (), Document.referrer difference