Js 之根据两个经纬度计算距离

一、示例

function getDistance(lat1, lng1, lat2, lng2) {
    let EARTH_RADIUS = 6378.137; // 地球半径
    let radLat1 = lat1 * Math.PI / 180.0; //lat1 * Math.PI / 180.0=>弧度计算
    let radLat2 = lat2 * Math.PI / 180.0;
    let a = radLat1 - radLat2;
    let b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;
    let 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 * EARTH_RADIUS;
    s = Math.round(s * 10000) / 10000; // 输出为公里
    return {
        m: s * 1000,
        km: Number(s.toFixed(2))
    }
}