比如我单击按钮 开启后台位置监控调用,再单击关闭后台监控,现在的问题是 开了然后关,再开发现onLocationChange事件触发2次,再关再开就会出现3,4,5次.这是如何避免
//开启后台获取地理位置坐标
  async enableLocationUpdateBackground() {
    const that = this;


    wx.startLocationUpdateBackground({
       success:async res=> {
        //console.log('开启后台定位', res)
        Notify({
          type: 'success',
          message: '开启上报定位信息'
        });
        //开始记录
        const userId = wx.getStorageSync('userId');
        const openId = wx.getStorageSync('openid');
        const userInfo = this.data.userInfo;
        const startloc = await that.getLocation();
        const startaddress = await that.reverseGeocoder({
          latitude: startloc.latitude,
          longitude: startloc.longitude
        });
        that.addTrackPath({
          "UserId": userId,
          "TrackingDateTime": moment().format("YYYY-MM-DDTHH:mm:ss.SSS[Z]"),
          "BeginDateTime": moment().format("YYYY-MM-DDTHH:mm:ss.SSS[Z]"),
          "Location": JSON.stringify(startloc),
          "latitude": startloc.latitude,
          "longitude": startloc.longitude,
          "Address": startaddress.result.address,
          "OpenId": openId,
          "NickName": userInfo.nickName,
          "AvatarUrl": userInfo.avatarUrl,
        })
        wx.onLocationChange(
          async res => {
            //console.log('onLocationChange', res)


            const loc = await that.reverseGeocoder({
              latitude: res.latitude,
              longitude: res.longitude
            });
            //console.log(loc)
            that.addTrackPath({
              "UserId": userId,
              "TrackingDateTime": moment().format("YYYY-MM-DDTHH:mm:ss.SSS[Z]"),
              "Location": JSON.stringify(res),
              "latitude": res.latitude,
              "longitude": res.longitude,
              "Address": loc.result.address,
              "OpenId": openId,
              "NickName": userInfo.nickName,
              "AvatarUrl": userInfo.avatarUrl,
            })
          });
      },
      fail(res) {
        that.setData({
          enable: false
        })
        console.log('开启后台定位失败', res)
        Notify({
          type: 'danger',
          message: '开启定位失败'
        });
        Dialog.alert({
          message: '请转到设置位置信息[使用小程序期间和离开小程序后]',
        }).then(() => {
          wx.navigateTo({
            url: '../manage/index',
          })
        });
         
      },
      complete: function (res) {
        // console.log('开启后台定位.complete', res)
        // wx.openSetting({
        //   success(res) {
        //     console.log(res.authSetting)
        //     res.authSetting = {
        //       "scope.userInfo": true,
        //       "scope.userLocation": true
        //     }
        //   }
        // })
      },
    });
  },
  //关闭后台获取地理坐标
  disableLocationUpdateBackground() {
    const that = this;
    wx.stopLocationUpdate({
      complete: async (res) => {
        wx.offLocationChange(res=>{
          
        })
        //结束记录
        const userId = wx.getStorageSync('userId');
        const openId = wx.getStorageSync('openid');
        const userInfo = this.data.userInfo;
        const endloc = await that.getLocation();
        const endaddress = await that.reverseGeocoder({
          latitude: endloc.latitude,
          longitude: endloc.longitude
        });
        that.addTrackPath({
          "UserId": userId,
          "TrackingDateTime": moment().format("YYYY-MM-DDTHH:mm:ss.SSS[Z]"),
          "EndDateTime": moment().format("YYYY-MM-DDTHH:mm:ss.SSS[Z]"),
          "Location": JSON.stringify(endloc),
          "latitude": endloc.latitude,
          "longitude": endloc.longitude,
          "Address": endaddress.result.address,
          "OpenId": openId,
          "NickName": userInfo.nickName,
          "AvatarUrl": userInfo.avatarUrl,
        })


        Notify({
          type: 'primary',
          message: '停止上报定位信息'
        });
      },
    })
  },