1.判断是否是IPhoneX手机 let isIphone = /iphone/gi.test(window.navigator.userAgent) let windowW = window.screen.width let windowH = window.screen.height let pixelRatio = window.devicePixelRatio let isIPhoneX = isIphone && pixelRatio && pixelRatio === 3 && windowW === 375 && windowH === 812 let is