Redirect mobile app in browser

mobile_os.js

getMobileOperatingSystem();
function getMobileOperatingSystem() {
    var userAgent = navigator.userAgent || navigator.vendor || window.opera;
    if (/android/i.test(userAgent)) {
        window.location = "https://play.google.com/store/apps/details?id=TTTTTTT"
        return "Android";
    }
    if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
        window.location = "https://itunes.apple.com/us/app/TTTTTTT/TTTTTTT";
        return "iOS";
    }
    return "unknown";
}