1. //判断手机环境
    2.  var u = navigator.userAgent, app = navigator.appVersion;
    3.  var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //android终端或者uc浏览器
    4.  var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
    5.  if(isiOS && screen.height >= 812){
    6.             //iphone x 
    7.             $('.DG_midMid').css("margin-bottom", "68px")
    8.             $('.DG_bottom').css({"padding-bottom":"34px","padding-top":"34px"});
    9.             var oMeta = document.createElement('meta');
    10.             oMeta.content = 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no,viewport-fit=cover';
    11.             oMeta.name = 'viewport';
    12.             document.getElementsByTagName('head')[0].appendChild(oMeta);
    13. };