微信小程序-高德/百度-根据经纬度获取地址

说明：
在微信小程序中【获取用户的当前定位】，并将经纬度从WGS-84坐标系转换为GCJ-02坐标系（高德地图使用的坐标系），同时【获取中文地址】信息

/**
 *  判断经纬度是否超出中国境内
 */
function isLocationOutOfChina(latitude, longitude) {
  if (longitude < 72.004 || longitude > 137.8347 || latitude < 0.8293 || latitude > 55.8271)
    return true;
  return false;
}


/**
 *  将WGS-84(国际标准)转为GCJ-02(火星坐标):
 */
function transformFromWGSToGCJ(latitude, longitude) {
  var lat = "";
  var lon = "";
  var ee = 0.00669342162296594323;
  var a = 6378245.0;
  var pi = 3.14159265358979324;

  if (isLocationOutOfChina(latitude, longitude)) {
    lat = latitude;
    lon = longitude;
  }
  else {
    var adjustLat = transformLatWithXY(longitude - 105.0, latitude - 35.0);
    var adjustLon = transformLonWithXY(longitude - 105.0, latitude - 35.0);
    var radLat = latitude / 180.0 * pi;
    var magic = Math.sin(radLat);
    magic = 1 - ee * magic * magic;
    var sqrtMagic = Math.sqrt(magic);
    adjustLat = (adjustLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
    adjustLon = (adjustLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
    latitude = latitude + adjustLat;
    longitude = longitude + adjustLon;
  }
  return { latitude: latitude, longitude: longitude };

}

/**
 *  将GCJ-02(火星坐标)转为百度坐标:
 */
function transformFromGCJToBaidu(latitude, longitude) {  
  var pi = 3.14159265358979324 * 3000.0 / 180.0;

  var z = Math.sqrt(longitude * longitude + latitude * latitude) + 0.00002 * Math.sin(latitude * pi);
  var theta = Math.atan2(latitude, longitude) + 0.000003 * Math.cos(longitude * pi);
  var a_latitude = (z * Math.sin(theta) + 0.006);
  var a_longitude = (z * Math.cos(theta) + 0.0065);

  return { latitude: a_latitude, longitude: a_longitude };
}

/**
 *  将百度坐标转为GCJ-02(火星坐标):
 */
function transformFromBaiduToGCJ(latitude, longitude) {
  var xPi = 3.14159265358979323846264338327950288 * 3000.0 / 180.0;

  var x = longitude - 0.0065;
  var y = latitude - 0.006;
  var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * xPi);
  var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * xPi);
  var a_latitude = z * Math.sin(theta);
  var a_longitude = z * Math.cos(theta);

  return { latitude: a_latitude, longitude: a_longitude };
}

/**
 *  将GCJ-02(火星坐标)转为WGS-84:
 */
function transformFromGCJToWGS(latitude, longitude) {
  var threshold = 0.00001;

  // The boundary
  var minLat = latitude - 0.5;
  var maxLat = latitude + 0.5;
  var minLng = longitude - 0.5;
  var maxLng = longitude + 0.5;

  var delta = 1;
  var maxIteration = 30;

  while (true) {
    var leftBottom = transformFromWGSToGCJ(minLat, minLng);
    var rightBottom = transformFromWGSToGCJ(minLat, maxLng);
    var leftUp = transformFromWGSToGCJ(maxLat, minLng);
    var midPoint = transformFromWGSToGCJ((minLat + maxLat) / 2, (minLng + maxLng) / 2);
    delta = Math.abs(midPoint.latitude - latitude) + Math.abs(midPoint.longitude - longitude);

    if (maxIteration-- <= 0 || delta <= threshold) {
      return { latitude: (minLat + maxLat) / 2, longitude: (minLng + maxLng) / 2 };
    }

    if (isContains({ latitude: latitude, longitude: longitude }, leftBottom, midPoint)) {
      maxLat = (minLat + maxLat) / 2;
      maxLng = (minLng + maxLng) / 2;
    }
    else if (isContains({ latitude: latitude, longitude: longitude }, rightBottom, midPoint)) {
      maxLat = (minLat + maxLat) / 2;
      minLng = (minLng + maxLng) / 2;
    }
    else if (isContains({ latitude: latitude, longitude: longitude }, leftUp, midPoint)) {
      minLat = (minLat + maxLat) / 2;
      maxLng = (minLng + maxLng) / 2;
    }
    else {
      minLat = (minLat + maxLat) / 2;
      minLng = (minLng + maxLng) / 2;
    }
  }

}

function isContains(point, p1, p2) {
  return (point.latitude >= Math.min(p1.latitude, p2.latitude) && point.latitude <= Math.max(p1.latitude, p2.latitude)) && (point.longitude >= Math.min(p1.longitude, p2.longitude) && point.longitude <= Math.max(p1.longitude, p2.longitude));
}

function transformLatWithXY(x, y) {
  var pi = 3.14159265358979324;
  var lat = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
  lat += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  lat += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
  lat += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
  return lat;
}

function transformLonWithXY(x, y) {
  var pi = 3.14159265358979324;
  var lon = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
  lon += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
  lon += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
  lon += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
  return lon;
}



module.exports = {
  isLocationOutOfChina: isLocationOutOfChina,
  transformFromWGSToGCJ: transformFromWGSToGCJ,
  transformFromGCJToBaidu: transformFromGCJToBaidu,
  transformFromBaiduToGCJ: transformFromBaiduToGCJ,
  transformFromGCJToWGS: transformFromGCJToWGS
}

使用高德地图API的/v3/geocode/regeo接口，根据经纬度获取中文地址信息。

 getAddress() {
    var that = this
    return new Promise((resolve, reject) => {
      var util = require('../../utils/WSCoordinate.js')
      let params = {}
      wx.getLocation({
        type: 'wgs84', //gcj02   wgs84
        success(res) {
          params.lon = util.transformFromWGSToGCJ(res.latitude, res.longitude).longitude
          params.lat = util.transformFromWGSToGCJ(res.latitude, res.longitude).latitude

          let detailAddress = ''
          wx.request({
            url: 'https://restapi.amap.com/v3/geocode/regeo', // 高德地图API的URL
            data: {
              key: '您的API密钥',
              location: params.lon + ',' + params.lat, // 注意参数顺序，高德API需要先经度后纬度
              output: 'json',
              radius: 1000,
              extensions: 'all'
            },
            success(res) {
              if (res.data.status === '1' && res.data.info === 'OK') {
                detailAddress = res.data.regeocode.formatted_address;
              } else {
                detailAddress = '未知地址';
              }
              params.detailAddress = detailAddress;
              resolve({
                code: 200,
                lat: params.lat,
                lon: params.lon,
                detailAddress: detailAddress
              }); // 成功回调
              that.setData({
                latitude: params.lat,
                longitude: params.lon,
                detailAddress: detailAddress
              });
            },
            fail(error) {
              console.error(error);
              reject(error); // 失败回调
            }
          });
        },
        fail(err) {
          if (err.errCode == 2) {
            Toast.fail('请打开手机定位!');
          } else if (!err.errCode) {
            Toast.fail('获取定位失败');
          }
          // reject({ code: 500 })//失败回调——不固定时需要抛出去
        }
      })
    })
  }

使用高德地图API的https://api.map.baidu.com/reverse_geocoding/v3/接口，根据经纬度获取中文地址信息。

   getBaiduLatLon() {
      var that = this
      return new Promise((resolve, reject) => {
        var util = require('../../utils/WSCoordinate.js')
        let params = {}
        wx.getLocation({
          type: 'gcj02', //gcj02   wgs84
          success(res) {
            params.lon = util.transformFromGCJToBaidu(res.latitude, res.longitude).longitude
            params.lat = util.transformFromGCJToBaidu(res.latitude, res.longitude).latitude
            let detailAddress = ''
            wx.request({
              url: 'https://api.map.baidu.com/reverse_geocoding/v3/',
              data: {
                ak: '您的API密钥',
                output: 'json',
                type: 'wgs84ll',
                location: params.lat + ',' + params.lon
              },
              success(res) {
                detailAddress = res.data.status == 0 ? res.data.result.formatted_address : '未知地址'
                params.detailAddress = detailAddress
                resolve({
                  code: 200,
                  lat: params.lat,
                  lon: params.lon,
                  detailAddress: detailAddress
                }) //成功回调
                that.setData({
                  latitude: params.lat,
                  longitude: params.lon,
                  detailAddress: detailAddress
                })
              },
            })
          },
          fail(err) {
            if (err.errCode == 2) {
              Toast.fail('请打开手机定位!');
            } else if (!err.errCode) {
              Toast.fail('获取定位失败');
            }
            // reject({ code: 500 })//失败回调——不固定时需要抛出去
          }
        })
      })
    }

使用

 async toUpdate() {
 	let info = await this.getBaiduLatLonT()
	 if (info.code == 200) {
	 }else{}
 }