如何实现移动端的城市定位以及城市区域代码adcode

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function getlocation() {              var u = navigator.userAgent;            var ua = navigator.userAgent.toLowerCase();            var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android终端            var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端            //GPS定位            function locationForGPS() {            /*********跟踪标记**********/   console.log('GPS定位开始+++');                var map, geolocation;                //加载地图，调用浏览器定位服务                map = new AMap.Map('iCenter');                map.plugin('AMap.Geolocation', function() {                    geolocation = new AMap.Geolocation({                        enableHighAccuracy: false,//是否使用高精度定位，默认:true                        timeout: 10000,          //超过10秒后停止定位，默认：无穷大                    });                    map.addControl(geolocation);                    geolocation.getCurrentPosition();                                        //getCityInfo是高德GPS定位里面的一个方法，先返回ip定位数据，由于IP定位有可能不准确，所以后面用GPS数据修正                    //                    geolocation.getCityInfo(function(status,result){                    /*********跟踪标记**********/    console.log('与GPS同步IP定位开始，进行数据写入+++');                        if (status === 'complete' && result.info === 'SUCCESS') {                    /*********跟踪标记**********/    console.log('同步IP定位成功，进行数据写入+++');                            if(isNull(sessionStorage.getItem('autouserchooselocationct'))){                                /*********跟踪标记**********/     console.log('未检测检查有上一次定位数据，进行数据写入+++');                                let cityAdcode=result.adcode;                                let cityName=result.city;                                                                sessionStorage.setItem('autouserchooselocationct', cityName);                                sessionStorage.setItem('autouserchooselocationcode', cityAdcode);                                                            /*********跟踪标记**********/    console.log('同步IP定位结束，进行数据写入完成+++');                            }                        }                    });                    AMap.event.addListener(geolocation, 'complete', onComplete);//返回定位信息                    AMap.event.addListener(geolocation, 'error', onError);      //返回定位出错信息                });                //GPS定位成功                function onComplete(data) {                    console.log(data)                     /*********跟踪标记**********/  console.log('GPS定位启动+++');                     //gsp定位精确到区，返回的adcode精确到了城市下属的区域，                     //想要获取城市的abcode还需要使用高德的另一个API，城市区域查询                                       let cityName=data.addressComponent.city;                    let geocoder = new AMap.Geocoder({});                    //地理编码,返回地理编码结果，                                        geocoder.getLocation(cityName, function(status, result) {                        if (status === 'complete' && result.info === 'OK') {                        /*********跟踪标记**********/       console.log('GPS定位成功，处理定位数据+++');                        /*********跟踪标记**********/     console.log('进行数据写入，覆盖同步IP的数据+++');                                let cityAdcode=result.geocodes[0].adcode;                                sessionStorage.setItem('autouserchooselocationct', cityName);                                sessionStorage.setItem('autouserchooselocationcode', cityAdcode);                                                    /*********跟踪标记**********/    console.log('GPS定位结束，进行数据写入完成+++');                            }                    });                }                //GPS定位失败                function onError() {                    /*********跟踪标记**********/ console.log('GPS定位失败开始启用ip定位+++');                    locationForIp(true);                     /*********跟踪标记**********/  console.log('gps-ip++...')                }            }            //IP定位            function locationForIp(tap) {                 /*********跟踪标记**********/if(tap){ console.log('GPS定位失败开始启用ip定位+++');}                     /*********跟踪标记**********/ console.log('ip定位开始+++');                var citysearch = new AMap.CitySearch();                //自动获取用户IP，返回当前城市                citysearch.getLocalCity(function (status, result) {                    if (status === 'complete' && result.info === 'OK') {                        if (result && result.city && result.bounds) {                            let GetUserLocation = result.city,                                GetUserLocationcode = result.adcode;                                /*********跟踪标记**********/console.log('ip定位成功，开始检查是否有上一次定位数据+++');                            if(isNull(sessionStorage.getItem('autouserchooselocationct'))){                             /*********跟踪标记**********/console.log('ip定位成功，未检测检查有上一次定位数据，进行数据写入+++');                                sessionStorage.setItem('autouserchooselocationct', GetUserLocation);                                sessionStorage.setItem('autouserchooselocationcode', GetUserLocationcode);                                                  /*********跟踪标记**********/console.log('ip定位成功，进行数据写入结束+++');                            }                        }                    } else {                                    /*********跟踪标记**********/console.log('ip定位失败，进行数据写入结束+++');                    }                })            }            if(isiOS){                /*********跟踪标记**********/console.log('ios设备启用IP定位');                locationForIp(false);            }else {                /*********跟踪标记**********/console.log('非ios设备启用GPS定位');                locationForGPS()            }        }};