in one of my webpages I want to send the user back to the previous page after some computation, but only if the previous page was a page from my website.
So I am wondering if there is an easy way to check that?
Thank you for any input!
You can however check how you arrived at the current page by using 2 methods:
document.referrer, but that only works if the user didn't block that, and gives you some limited info.
A more robust method might be to set some information about the previous page in either the URL, or in a SESSION variable.
No.
For security reasons the History object doesn't allow the non-privileged code to access the URLs of other pages in the session history, but it does allow it to navigate the session history.
来源：https://stackoverflow.com/questions/20129542/can-i-check-what-site-window-history-back-will-bring-the-user-to