getParameterByName(paramName, currentUrl) { if (!currentUrl) currentUrl = window.location.href; paramName = paramName.replace(/[[]]/g, ‘\$&’); var regex = new RegExp(‘[?&]’ + paramName + ‘(=([^&#]*)|&|#|$)’), results = regex.exec(currentUrl); if (!results) return null; if (!results[2]) return ”; return decodeURIComponent(results[2].replace(/+/g, ‘ ‘)); }