I need to get the entire query string (all parameters) of current page and append it to an existing link in page.

For example:

• URL - https://www.example.com/test?param1="a"&param2="b"
• Link in page - https://www.bar.com/goofy
• Final link - https://www.bar.com/goofy?param1="a"&param2="b"

Please, in the case that Link in page already has some parameters, query string should be chained in a smart way:

• Link in page - https://www.bar.com/goofy?reg="ccc"
• Final link - https://www.bar.com/goofy?reg="ccc"&param1="a"&param2="b"

Please, any suggest?