how to use params in javascript code example

Example 1: get params js

// www.example.com/users?token=12345

let params = (new URL(document.location)).searchParams;
let token = params.get("token");
// 12345

Example 2: javascript get parameter

let params = {};
window.location.search.slice(1).split('&').forEach(elm => {
  if (elm === '') return;
  let spl = elm.split('=');
  const d = decodeURIComponent;
  params[d(spl[0])] = (spl.length >= 2 ? d(spl[1]) : true);
});

// https://example.com/?foo=bar&best%20food=D%C3%B6ner
params['foo'] // bar
params['best food'] // Döner

Example 3: parameters in javascript

function myFunction(x, y) {
  if (y === undefined) {
    y = 2;
  }
}