微信小程序腾讯地图获取直线距离

//两个点的经纬度
distance: function (la1, lo1, la2, lo2) {
    var La1 = la1 * Math.PI / 180.0;
    var La2 = la2 * Math.PI / 180.0;
    var La3 = La1 - La2;
    var Lb3 = lo1 * Math.PI / 180.0 - lo2 * Math.PI / 180.0;
    var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(La3 / 2), 2) + Math.cos(La1) * Math.cos(La2) * Math.pow(Math.sin(Lb3 / 2), 2)));
    s = s * 6378.137;
    s = Math.round(s * 10000) / 10000;
    s = s.toFixed(2);
    return s;
  }