how to declare a variable from a url input in javascript code example

Example 1: js get url parameter

var url_string = "http://www.example.com/t.html?a=1&b=3&c=m2-m3-m4-m5"; //window.location.href
var url = new URL(url_string);
var c = url.searchParams.get("c");
console.log(c);

Example 2: js get url parameter

const queryString = window.location.search;
const urlParams = new URLSearchParams(queryString);
const code = urlParams.get('code')