function isMobile(){

    return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);

}

function isIphone(){

    return /iphone/gi.test(navigator.userAgent);

}

function isAndroid(){

    return /Android/gi.test(navigator.userAgent);

}

function isIphoneX(){

    var isIphone=/iphone/gi.test(navigator.userAgent);

    if(isIphone&& (screen.height == 812 && screen.width == 375)){

        return true;

    }else{

        return false;

    }

}