How can javascript-js code access page A and jump to page B for normal display, while directly accessing page B will jump to page

How can js Code access page A and jump to page B for normal display? When you directly access page B, it will jump to page A. That is to say, page B cannot be accessed directly and must jump through page, to go to page B Normally. How can js Code access page A and jump to page B for normal display? When you directly access page B, it will jump to page A. That is to say, page B cannot be accessed directly and must jump through page, to go to page B Normally.

Reply content:

How can js Code access page A and jump to page B for normal display? When you directly access page B, it will jump to page A. That is to say, page B cannot be accessed directly and must jump through page, to go to page B Normally.

Can this be done?
When page a jumps to page B, the following parameters are included in the URL:
B .html? Param = 0
If a parameter exists, the system does not jump to page.

The difference between A and B is that the Referer in the HTTP header is different. The content of the Referer is the address of A, and direct access is empty.
So you only need to judge Referer on page B.
Php is used$ _ SERVER ['HTTP _ referer'].

Pass CheckDocument. referrer

By the way, I gave you some information about Baidu!