// 判断浏览器函数
 function isMobile(){
  if(window.navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)) {
   return true; // 移动端
  }else{
   return false; // PC端
  }
 }

var os = function() { 
  var ua = navigator.userAgent, 
  isWindowsPhone = /("-----");
}

window.isInWeixinApp = function() {
    return /MicroMessenger/.test(navigator.userAgent);
  };

/**
   * 判断是否是微信环境
   */
  function getIsWxClient () {
    var ua = navigator.userAgent.toLowerCase();
    if (ua.match(/MicroMessenger/i) == "micromessenger") {
      return true;
    }
    return false;
  };

 var isWechart = function () {
  var rst = true
  if(window.navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)){
   var ua = navigator.userAgent.toLowerCase();
   if (!(ua.match(/MicroMessenger/i) == "micromessenger")) {
    rst = false;
   }
  }else {
   rst = false;
  }
  return rst;
 }

 //平台、设备和操作系统 
   var system = { 
    win: false, 
    mac: false, 
    xll: false, 
    ipad: false 
   }; 
   //检测平台 
   var p = navigator.platform; 
   system.win = p.indexOf("Win") == 0; 
   system.mac = p.indexOf("Mac") == 0; 
   system.x11 = (p == "X11") || (p.indexOf("Linux") == 0); 
   system.ipad = (navigator.userAgent.match(/iPad/i) != null) "在PC端上打开的");
   } else { 
    var ua = navigator.userAgent.toLowerCase(); 
    if(ua.match(/MicroMessenger/i)=="micromessenger") { 
     alert("在手机端微信上打开的"); 
    } else { 
     alert("在手机上非微信上打开的"); 
    } 
   }

/**
   *判断是否是app环境
   */
  function getIsApp () {
    var ua = navigator.userAgent.toLowerCase();
    if (ua.match(/isapp/i) == "isapp") {
      return true;
    }
    return false;
  };

/**
   *判断是否是app环境
   */
  function getIsApp () {
    var ua = navigator.userAgent.toLowerCase();
    if (ua.match(/isapp/i) == "isapp") {
      return true;
    }
    return false;
  };

function isIPhoneX(fn){
  var u = navigator.userAgent;
  var isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
  if (isIOS) {    
    if (screen.height == 812 && screen.width == 375){
      //是iphoneX
    }else{
      //不是iphoneX
    } 
  }
}