小程序逆定位、两坐标计算距离

根据坐标逆定位查询位置所在城市信息

  onLoad: function (options) {
    let that = this
    wx.getLocation({
      type: 'wgs84', // 默认为 wgs84 返回 gps 坐标，gcj02 返回可用于   wx.openLocation 的坐标
      success: res => {
        const latitude = res.latitude
        const longitude = res.longitude
        wx.request({ 
        //GET请求  location    位置坐标，格式：location= 39.984154,116.307490
       // get_poi    是否返回周边POI列表：1.返回；0不返回(默认)    get_poi=1
       // key    是开发密钥（Key）
          url: "https://apis.map.qq.com/ws/geocoder/v1/?location=" + latitude + "," + longitude + "&key=" + locationId,
           success: (res) => {
              console.log(res)
            }
           }）
         },
      }）
    }             

根据两坐标计算距离

distance.js

 function distance(la1, lo1, la2, lo2) {
     var La1 = la1 * Math.PI / 180.0;
     var La2 = la2 * Math.PI / 180.0;
     var La3 = La1 - La2;
     var Lb3 = lo1 * Math.PI / 180.0 - lo2 * Math.PI / 180.0;
     var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(La3 / 2), 2) + Math.cos(La1) * Math.cos(La2) * Math.pow(Math.sin(Lb3 / 2), 2)));
     s = s * 6378.164; //地球半径
     return s = Math.round(s * 1000000000) / 1000000000;
 }

 export {
     distance
 }

  onLoad: function (options) {

    let that = this

    

    wx.getLocation({

      type: 'wgs84', // 默认为 wgs84 返回 gps 坐标，gcj02 返回可用于 wx.openLocation 的坐标

      success: res => {

        // // success

        const latitude = res.latitude

        const longitude = res.longitude

        that.setData({

          latitude: latitude,

          longitude: longitude,

          show: false

        })

        let CITY = wx.getStorageSync('city')

        wx.setStorageSync("location", res);

        wx.request({

          url: "https://apis.map.qq.com/ws/geocoder/v1/?location=" + latitude + "," +

            longitude + "&key=" + locationId,

          success: (res) => {

            if (res.statusCode == 200) {

              let city = res.data.result.address_component.city

              let address = res.data.result.ad_info.city_code //city_code

              let data = {}

              if (CITY != '') {

                if (city == CITY.cityName) {

                  data.cityNo = address

                } else {

                  data.cityCode = CITY.cityCode

                }

                that.setData({

                  cityName: CITY.cityName,

                  city: city

                  // code: address

                })

              } else {

                data.cityNo = address

                that.setData({

                  cityName: city,

                  city: city

                  // code: address

                })

              }

              // 搜索学校

              http.request({

                url: 'school/list',

                data: data,

                success: (res) => {

                  let location = wx.getStorageSync("location")

                  let schoolDataListArr = [...res.data.list]

                  if (location != '') {

                    schoolDataListArr.forEach(element => {

                      let m_x = location.latitude

                      let m_y = location.longitude

                      let s_x = element.location_X

                      let s_y = element.location_Y

                      let s = distance(m_x, m_y, s_x, s_y)

                      if (s > 1) {

                        let S = parseInt(s)

                        element.d_tance = S + "km"

                      } else {

                        let S = (s * 1000).toFixed(1)

                        element.d_tance = S + "m"

                      }

                    })

                  }

                  this.setData({

                    show: false,

                    schoolDataList: schoolDataListArr

                  });

                },

                fail: function (err) {

                  wx.showToast({

                    title: '网络错误',

                    icon: "none"

                  })

                }

              })

            } else {

              that.setData({

                show: true

              });

            }

          },

          fail: function (err) {

            that.setData({

              show: true

            });

          }

        })

      },

      fail: function (err) {

        that.setData({

          show: true

        });

      }

    })