how to get the URL query parameters with javascript and display the result on a browser 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: javascript get url parameters

let url = 'https://www.example.com?name=n1&name=n2';
let params = (new URL(url)).searchParams;
params.get('name') // "n1"
params.getAll('name') // ["n1", "n2"]