append to url and refresh page

Question

I am looking to write a piece of javascript that will append a parameter to the current url and then refresh the page - how can I do this?

Answer 1

Shorter than the accepted answer, doing the same, but keeping it simple:

window.location.search += '¶m=42';

We don't have to alter the entire url, just the query string, known as the search attribute of location.

When you are assigning a value to the search attribute, the question mark is automatically inserted by the browser and the page is reloaded.