javascript - 从 Google map 地理编码器获取返回值

Question

我正在尝试根据 Google map 地理编码器的经纬度坐标获取位置名称。我似乎无法从地理编码器回调中提取值。这是我的代码:

geocoder = new google.maps.Geocoder();
var address = "";
var lat = 54.1234;
var lng = -114.1234;
var latlng = new google.maps.LatLng(lat, lng);

geocoder.geocode({'latLng': latlng } , function(results,status) {

    if (status == google.maps.GeocoderStatus.OK) {
        address = results[1].formatted_address; //want to get this address
    } else {
        address = 'error';
    }
});

window.alert(address) 
//address is an empty string here, but I want the value from inside the geocoder
//want access to address here to do other operations with it

Google Developers 网站上的地理编码器文档几乎不存在， 我在试图找到类似的例子时遇到问题。我已经超出了我的舒适范围，所以需要帮助 会很好!

Answer 1

该调用是异步的，因此该值存在于回调函数内:

geocoder.geocode({'latLng': latlng } , function(results,status) {
  if (status == google.maps.GeocoderStatus.OK) {
    address = results[1].formatted_address; //want to get this address
  } else {
    address = 'error';
  }
  window.alert(address);
});

// The code here runs before the callback function