/*** 已知两地经纬度求得直线距离* @param {Number} lat1 纬度1* @param {Number} lng1 经度1* @param {Number} lat2 纬度2* @param {Number} lng2 经度2* @returns {Number} 距离(米)* @example* distanceBetweenTwoPlaces(39.915, 116.404, 39.975, 116.494)* // => 11149.578*/
export function distanceBetweenTwoPlaces(lat1, lng1, lat2, lng2) {const radLat1 = (lat1 * Math.PI) / 180.0;const radLat2 = (lat2 * Math.PI) / 180.0;const a = radLat1 - radLat2;const 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 * 6378.137; // EARTH_RADIUS;s = Math.round(s * 10000) / 10000;return s * 1000;
}