Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* 测量地理坐标的距离
* @method util/measureDistance
* @param {Number} lat1 坐标1精度
* @param {Number} lng1 坐标1纬度
* @param {Number} lat2 坐标2精度
* @param {Number} lng2 坐标2纬度
* @returns {Number} 2个坐标之间的距离（千米）
* @example
* var $measureDistance = require('@spore-ui/kit/packages/util/measureDistance');
* var distance = $measureDistance(0, 0, 100, 100);
* // 9826.40065109978
*/
function measureDistance(lat1, lng1, lat2, lng2) {
var radLat1 = (lat1 * Math.PI) / 180.0;
var radLat2 = (lat2 * Math.PI) / 180.0;
var a = radLat1 - radLat2;
var b = (lng1 * Math.PI) / 180.0 - (lng2 * Math.PI) / 180.0;
var powVal = Math.pow(Math.sin(a / 2), 2);
var ccpVal = Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2);
var sqrtVal = Math.sqrt(powVal + ccpVal);
var s = 2 * Math.asin(sqrtVal);
// 地球半径
s *= 6378.137;
return s;
}
module.exports = measureDistance;
|