javascript - 使用 javascript 异步调用 google 服务

Question

我有一个数组

SchoolAddress[0] = Abelsvej 98, 4100, Ringsted;
SchoolAddress[1] = Prstevej 19, 4100, Ringsted;
SchoolAddress[2] = Haraldsvej 77, 4100, Ringsted;

我必须获取该地址的纬度和经度。

我为此使用谷歌地理编码器。

for (var i = 0; i < schools.length; i++) 
{
    var address = schools[i][1];
    var geocoder = new google.maps.Geocoder();
    geocoder.geocode({ 'address': address }, function (results, status) 
    {
        var location = results[0].geometry.location;
        schoolslat[i] = location.lat() + ', ' + location.lng();
    });
} 

这里发生的情况是，由于调用需要一些时间，来自调用的值不会发送到正确的 schoollat​​[i]。

Answer 1

您可以使用closure在您的请求中卡住变量i:

for (var i = 0; i < schools.length; i++) 
{
    (function(i){
        var address = schools[i];
        var geocoder = new google.maps.Geocoder();
        geocoder.geocode({ 'address': address }, function (results, status) 
        {
            var location = results[0].geometry.location;
            schoolslat[i] = location.lat() + ', ' + location.lng();
        });
    }(i));
}

UPD:

JSFiddle example .