H5判断系统和环境

1.判断是不是微信环境

function isWeiXin() {
      var ua = window.navigator.userAgent.toLowerCase();
      //console.log(ua);//mozilla/5.0 (iphone; cpu iphone os 9_1 like mac os x) applewebkit/601.1.46 (khtml, like gecko)version/9.0 mobile/13b143 safari/601.1
      if(ua.match(/MicroMessenger/i) == 'micromessenger') {
          return true;
      } else {
          return false;
      }
  }

2.判断是iOS还是Android环境

isAndroid_ios() {  
      var u = navigator.userAgent, app = navigator.appVersion;  
      var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1; //android终端或者uc浏览器  
      var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端  
      var isIOS1 = u.indexOf("iPhone") > -1 || u.indexOf("iOS") > -1;
      return isiOS || isIOS1 ? 'ios' : 'android'
},