JSFiddle - React, Tailwind, and code Playground

JavaScript

function getUrlParams(url, key) {
    var vars = [], hash;
        var hashes = url.slice(url.indexOf('?') + 1).split('&');
        for (var i = 0; i < hashes.length; i++) {
            hash = hashes[i].split('=');
            vars.push(hash[0]);
            vars[hash[0]] = hash[1];
        }
        return vars[key];
    }

alert(getUrlParams("www.site.com/page?idi=22&selse=88", "idi"));