How to enter a URL to jump to the target URL_html/css_WEB-ITnose

For example, if I enter www.A.com/***&jumpUrl=http://www.B.com/*** on the browser, the target address I want to achieve is http://www.B .com/***, but it must start with www.A.com/ in the browser. This is important.
How to achieve this? Entering www.A.com/***&jumpUrl=http://www.B.com/*** was my own thought and was wrong.
Could you please tell me how to enter the address?

Reply to the discussion (solution)

js parses the url parameters, finds a jumpUrl, parses out the parameter value, and then window.location.href="http://www. B.com";

Determine the source in a page such as http://www.B.com (you can use document.referrer to judge). If it does not come from www.A.com, jump back to www.A .com