将URL的特定部分传递到页面上的另一个URL以进行跟踪

Question

I'm interested if it's possible to grab a specific part of url and pass it another url using only JS/HTML?

For example URL of the page is example.com/prelander/12345

Number 12345 is dynamic number and link setup can vary if needed (each user visiting website has it's own). On the page there's a link to a second page which needs to contain this dynamic parameter.

Second page contains pixel, example:

img src="https://www.pixeltrackingexample.com/et/event.php&cid=INSERT_CLICK_ID" border="0" width="1" height="1" /

So basically dynamic parameter from the first URL could end up in the pixel tracking url. Any ideas if it's achievable?

Thank you