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 isIPhoneXSMax = isIphone && pixelRatio && pixelRatio === 3 && windowW === 414 && windowH === 896  let isIPhoneXR = isIphone && pixelRatio && pixelRatio === 2 && windowW === 414 && windowH === 896  if (isIPhoneX || isIPhoneXSMax || isIPhoneXR) {    // 底部增加fix-iphonex-bottm 樣式    $(".contact-box").addClass('fix-iphonex-bottom')    // 底部增加iphone-footer-bg樣式 初始none,條件滿足block    $(".iphone-footer-bg").addClass('iphonexshow')  }

.fix-iphonex-bottom {  bottom: 34px !important;}

.iphone-footer-bg {  height: 34px;  background: #6D6D6D;  width: 100%;  position: absolute;  bottom: -33px;  display: none;}.iphonexshow {  display: block !important;}