JSFiddle - React, Tailwind, and code Playground

by Lasith De Silva

JavaScript

function getParameterByName(name, url) {
    if (!url) url = window.location.href;
    url = 'a=1&b=2&c=3&postcode=rg20bs';
    name = name.replace(/[\[\]]/g, '\\$&');
    var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, ' '));
}

var foo = getParameterByName('foo');
alert(foo);