关于多平台的问题

dcloud官方称是6大平台可以使用，其中包括手机浏览器。
现在我们的项目 很多和h5+绑的很死。
比如首先我们有gps定位，其次我们有本地存储读写，我们还有页面返回触发等等
针对上面三个方法，我们代码是这样写的:
gps的是:

gps: function() {  
        var androidGpsFlag = function getGEO_status() {  
            var context = plus.android.importClass("android.content.Context");  
            var locationManager = plus.android.importClass("android.location.LocationManager");  
            var main = plus.android.runtimeMainActivity();  
            var mainSvr = main.getSystemService(context.LOCATION_SERVICE);  
            //console.log(mainSvr.isProviderEnabled(locationManager.GPS_PROVIDER));  
            return mainSvr.isProviderEnabled(locationManager.GPS_PROVIDER);  
        }  

        var iosGpsFlag = function() {  
            var CLLocationManager = plus.ios.import("CLLocationManager");  
            var authorizationStatus = CLLocationManager.authorizationStatus();  
            var gpsStatus = false;  
            switch (authorizationStatus) {  
                case 0:  
                    /// User has not yet made a choice with regards to this application  
                    break;  
                case 1:  
                    // This application is not authorized to use location services.  Due  
                    // to active restrictions on location services, the user cannot change  
                    // this status, and may not have personally denied authorization  
                    break;  
                case 2:  
                    // User has explicitly denied authorization for this application, or  
                    // location services are disabled in Settings.  
                    break;  
                case 3:  
                    gpsStatus = true;  
                    // User has granted authorization to use their location at any time,  
                    // including monitoring for regions, visits, or significant location changes.  
                    break;  
                case 4:  
                    gpsStatus = true;  
                    // User has granted authorization to use their location only when your app  
                    // is visible to them (it will be made visible to them if you continue to  
                    // receive location updates while in the background).  Authorization to use  
                    // launch APIs has not been granted.  
                    break;  
                case 5:  
                    // This value is deprecated, but was equivalent to the new -Always value.  
                    break;  
                    defalut:  
                        break;  
            }  
            return gpsStatus;  
        }  
        if (mui.os.android) {  
            return androidGpsFlag();  
        } else if (mui.os.ios) {  
            return iosGpsFlag();  
        }  
    }

很显然调用到底层了，这个肯定没法在浏览器里使用。
官方客服给出的解决方案是:
https://github.com/dcloudio/plusto/blob/master/geolocation/h5toplus.js

2.存储的使用。
if(plus.storage.getItem(saltkey)!=null){}
这个应该怎么用 用html5的sessionStorange么？还是mui里有什么兼容的方法。

3.页面返回触发方法，用户网页回跳时出发，比如登录完毕后调回某个界面触发：
var self = plus.webview.currentWebview();
var opener = self.opener();
mui.fire(opener, 'back', parame);
那在手机版里 是需要自己写代码么？？？还是mui提供了平滑过度