经纬度距离计算

lonlat.js

var appFunc = {
    getDistance: function (firstLon, firstLat, secondLon, secondLat) {
        var radFirstLon = appFunc.rad(firstLon);
        var radFirstLat = appFunc.rad(firstLat);
        var radSecondLon = appFunc.rad(secondLon);
        var radSecondLat = appFunc.rad(secondLat);

        var latDiff = radFirstLat - radSecondLat;
        var lonDiff = radFirstLon - radSecondLon;

        var distance = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(latDiff / 2), 2) + Math.cos(radFirstLat) * Math.cos(radSecondLat) * Math.pow(Math.sin(lonDiff / 2), 2)));
        distance = distance * appFunc.EARTH_RADIUS;
        distance = Math.round(distance * 10000) / 10000;
        return distance;
    },

    EARTH_RADIUS: 6378.137,

    rad: function (du) {
        return du * Math.PI / 180.0;
    }
};

// 纬度：latitude
// 经度：longitude

var firstLon = 121.413413;
var firstLat = 31.157984;
var secondLon = 121.604824;
var secondLat = 31.181937;

console.log(appFunc.getDistance(firstLon, firstLat, secondLon, secondLat));