Question

如何按距离ASC排序我的阵列结果？

我需要根据我的地理坐标（纬度/经度）对循环进行排序

请参阅我的代码：

function calculateDistance(lat1, lon1, lat2, lon2)
{
    var radlat1 = Math.PI * lat1/180
    var radlat2 = Math.PI * lat2/180
    var radlon1 = Math.PI * lon1/180
    var radlon2 = Math.PI * lon2/180
    var theta = lon1-lon2
    var radtheta = Math.PI * theta/180
    var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
    dist = Math.acos(dist)
    dist = dist * 180/Math.PI
    dist = dist * 60 * 1.1515
    dist = dist * 1.609344 * 1000
    return Math.round(dist)
}
function places()
{
    db.transaction(function(transaction) {
        transaction.executeSql('SELECT * FROM places', [], function (tx, results) {
            for (i = 0; i < results.rows.length; i++)
            {
                var distance = calculateDistance(mylat, mylng, results.rows.item(i).lat, results.rows.item(i).lng);
            }
        }, null);
    });
}

Answer 1

您可以计算结果在循环内的距离，然后排序：

for (i = 0; i < results.rows.length; i++) {
  results.rows[i].distance = calculateDistance(mylat, mylng, results.rows.item(i).lat, results.rows.item(i).lng);
}
results.rows.sort(function(a, b) {
  return a.distance - b.distance;
})

在Cordova按距离排序

1 个答案: