判断请求是浏览器发出还是小程序发出？

直接上代码：

 <script type="text/javascript" src="https://res.wx.qq.com/open/js/jweixin-1.3.2.js"></script>
  <script type="text/javascript">
        function openMap()
        {
             const ua = window.navigator.userAgent.toLowerCase();
                if (ua.indexOf('micromessenger') == -1) {//不在微信或者小程序中
                        window.location.href = 'https://apis.map.qq.com/uri/v1/marker?marker=coord:31.235371,121.488571;title:国拍大楼;';
                } else {
                    wx.miniProgram.getEnv(function (res) {
                        //true代表在小程序里
                        if (res.miniprogram) {
                             wx.miniProgram.navigateTo({ url: '../../pages/gpmap/gpmap' })
                        }
                        else {
                             window.open("https://api.map.baidu.com/marker?location=31.24119,121.495083&title=我的位置&content=国拍大楼&output=html")
                        }
                    })
                }
        }
  </script>