function getAppVersion(){    
   var browser = {  
        versions: function () {  
            var u = navigator.userAgent, app = navigator.appVersion;  
            var ua = navigator.userAgent.toLowerCase();
            return {         //移动终端浏览器版本信息  
               mobile: !!u.match(/AppleWebKit.*Mobile.*/), 
               ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), 
               android: ( u.indexOf(‘Android‘) > -1 || u.indexOf(‘Linux‘) > -1 ? "Android" : false ), //android终端或uc浏览器  
               iPhone: (u.indexOf(‘iPhone‘) > -1 ? "iPhone" : false ),                             //是否为iPhone或者QQHD浏览器  
               wechat: ( ua.match(/MicroMessenger/i) == "micromessenger" ? "micromessenger" : false ),
               winPhone: (u.indexOf(‘Windows Phone‘) > -1 ? "winPhone" : false )  //winPhone 手机
            };  
        }(),  
        language: (navigator.browserLanguage || navigator.language).toLowerCase()  
    }  
    if(browser.versions.mobile){
       if(browser.versions.wechat){
          return "micromessenger";
       }
       if(browser.versions.android && !browser.versions.wechat){
          return "Android" ;
       }
       if(browser.versions.iPhone && !browser.versions.wechat){
          return "iPhone" ;
       }
    }else{
       if(browser.versions.wechat){
          return "pcmicromessenger";
       }
    }
}

设备类型判断