JavaScript 判断 iPhone X

if (navigator.userAgent.match(/(iPhone)/)) {
    if ((screen.availHeight == 812) && (screen.availWidth == 375)) {
        if ((window.innerHeight == "375") && (window.innerWidth == "812")) {// iPhone X Landscape 横屏
        
        } else {// iPhone X Portrait 竖屏
            
        }
    }
}