Using location.search to locate a parameter's value

location.search will return all after question mark including it. So there is universal js to get value of the first parameter (even if url has more parameters):

var desire = location.search.slice(1).split("&")[0].split("=")[1]

Example: let's take url http://example.com?name=jon&country=us

1. location.search will be equal to ?name=jon&country=us
2. .slice(1) skips the ?, returning the rest of the string.
3. .split("&")[0] splits it into two strings (name=jon and country=us) and takes first one
4. .split("=")[1] splits name=jon into name and jon and takes the second one. Done!

let url = new URL('www.examplesite.com?yourname=gilgilad');
let searchParams = new URLSearchParams(url.search);
console.log(searchParams.get('yourname'));

you can consider also to user window.location or window.location.search directly

let searchParams = new URLSearchParams(window.location.search);
console.log(searchParams.get('yourname'));

A more generic solution to split the location.search query parameters and convert them into an object:

var a = location.search.split("&");
var o = a.reduce(function(o, v) {
    var kv = v.split("=");
    kv[0] = kv[0].replace("?", "");
    o[kv[0]] = kv[1];
    return o;
    },
{});