微信小程序 功能函数 地图定位相对直线距离

 

GetDistance:function(lat1, lng1, lat2, lng2){

// console.log(lat1)

var radLat1 = lat1 * Math.PI / 180.0;

var radLat2 = lat2 * Math.PI / 180.0;

 

var a = radLat1 - radLat2;

 

var b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;

 

var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));

 

s = s * 6378.137;

 

s = Math.round(s * 10000) / 10000;

console.log(s)

return s;

},

/**

* 生命周期函数--监听页面加载

*/

onLoad: function (options) {

let that = this;

let a1,a2,b1,b2;

wx.chooseLocation({

success: function (res) {

a1 = res.latitude;

a2=res.longitude;

wx.chooseLocation({

success: function (res) {

b1 = res.latitude;

b2 = res.longitude;

console.log(a1)

console.log(a2)

console.log(b1)

console.log(b2)

that.GetDistance(a1, a2, b1, b2)

}

})

}

})

// wx.getLocation({

// type: 'wgs84',

// success: function (res) {

// console.log(res.latitude)

// console.log(res.longitude)

// }

// })

 

 

},