how to get history.back value in javascript

Question

How can i get the URL of the previous page in JavaScript?
I mean the value of this function:

history.back()

or this one :

history.go(-1)

Answer 1

For privacy reasons, you will never be able to do that.

Answer 2

In JavaScript, you use the document.referrer property, which will give you the URL of the page where the user came from.