微信小程序开发之实现一个跑步小程序

<view class="map">
    <map id="map" longitude="{{longitude}}" latitude="{{latitude}}" scale="{{scale}}" markers="{{markers}}"
        polyline="{{polyline}}" style="width: 100%; height: 100%"></map>
</view>

data: {
    latitude: '',
    longitude: '',
    scale: 16,
    markers: [],
    polyline: [{
        points: [],
        color: '#FB8337',
        width: 5
    }]
},

// 获取当前位置
getNowLocation() {
    wx.getLocation({
        type: 'gcj02',
        isHighAccuracy: true,
        success: (res) => {
            this.setData({
                latitude: res.latitude,
                longitude: res.longitude,
            })
        }
    })
},

  "permission": {
        "scope.userLocation": {
            "desc": "你的位置信息将用于小程序位置接口的效果展示"
        }
    },
      "requiredBackgroundModes": [
        "location"
    ],
    "requiredPrivateInfos": [
        "getLocation",
        "onLocationChange",
        "startLocationUpdate",
        "startLocationUpdateBackground"
    ]

<button bindtap="startRun" class="btn" type="primary">开始跑步</button>

.map {
    width: 100%;
    height: 100vh;
}

.btn {
    position: absolute;
    bottom: 100rpx;
    left: 0;
    right: 0;
    z-index: 1000;
}

// 判断手机定位是否开启 
checkGPS() {
    wx.getSystemInfo({
        success: (res) => {
            if (!res.locationEnabled) {
                wx.showModal({
                    title: '提示',
                    content: '请先开启手机GPS定位',
                    showCancel: false
                })
                return;
            }
        }
    })
},

wx.startLocationUpdate({
    success: () => {
        wx.onLocationChange((res) => {
            this.setData({
                latitude: res.latitude,
                longitude: res.longitude
            })
            wx.getSetting({
                success: (res) => {
                    wx.hideLoading()
                    if (!res.authSetting['scope.userLocationBackground']) {
                        wx.showModal({
                            title: '提示',
                            content: '为确保后台定位精确，请先设置 "使用小程序时和离开后允许" 再进行跑步',
                            showCancel: false,
                            success: function (res) {
                                if (res.confirm) {
                                    wx.openSetting()
                                }
                            }
                        })
                    } else {
                        this.running();
                    }
                }
            })
            wx.offLocationChange();
            wx.stopLocationUpdate();
        })
    },
})

// 开始前后台定位
wx.startLocationUpdateBackground({
    success: () => {
        draw();
        time();
    },
    fail: () => {
        wx.showToast({
            title: '后台定位开启失败',
            icon: 'none'
        })
    }
})

 let arr = this.data.polyline[0].points;
    wx.onLocationChange((res) => {
        if (dis > 0) {
            arr.push({
                latitude: res.latitude,
                longitude: res.longitude
            })
            totalDistance = Number(((totalDistance + dis) * 100).toFixed(2)) / 100;
        }
    }
    this.setData({
        'polyline[0].points': arr
    })
})