//計算兩點位置距離 getDistance: function (lat1, lng1, lat2, lng2) { lat1 = lat1 || 0; lng1 = lng1 || 0; lat2 = lat2 || 0; lng2 = lng2 || 0; var rad1 = lat1 * Math.PI / 180.0; var rad2 = lat2 * Math.PI / 180.0; var a = rad1 - rad2; var b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0; var r = 6378137; var distance = r * 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(rad1) * Math.cos(rad2) * Math.pow(Math.sin(b / 2), 2))); /*if (distance > 1000){ distance = Math.round(distance / 1000); }*/ return distance; }