Javascript Can'；t从angular.forEach循环中更新全局变量

在尝试从Angular.forEach循环中修改全局变量时，我似乎被卡住了

我可以很好地修改变量，但当在循环之外访问时，我似乎无法将更改应用于变量

我尝试了多种“var self=this”并在整个循环中使用“this.addresses=[]”来访问数组，但这导致了相同的问题。当我到达我的“return”语句时，我的更改丢失了

代码如下：

$scope.getLocation = function(val) {
var geocoderRequest = {
    address: String(val),
    componentRestrictions: {
        'country': 'US'
    }
};
var addresses = [1]; // **** shows addresses as [1] *****
geocoder.geocode(geocoderRequest, function(callbackResult) {
    console.log('address in geocode: ' + addresses); // ***** shows addresses as [1] ****
    var f = '';
    angular.forEach(callbackResult.results, function(item) {
        console.log('address in angular: ' + addresses); // **** shows addresses as [1] *****
        if (item.types[0] == 'locality') {
            for (f = 1; f < item.address_components.length; f++) {
                if (item.address_components[f].types[0] ==
                    "administrative_area_level_1") {
                    addresses.push(item.address_components[0].short_name + ', ' + item.address_components[
                        f].short_name);
                    console.log('addresses in each: ' + addresses); // **** shows addresses as [1, 2, 3] after I 'push' 2 and 3 into addresses array ****
                    break;
                }
            }
        }
    });
});
console.log('addresses outside: ' + addresses); // ***** shows addresses as [1] even after pushing 2 and 3 *****
return addresses;

$scope.getLocation=函数（val）{
var geocoderRequest={
地址：字符串（val），
组件限制：{
“国家”：“美国”
}
};
变量地址=[1]；//****将地址显示为[1]*****
geocoder.geocode（geocoderRequest，函数（callbackResult）{
console.log（'地理代码中的地址：'+地址）；//****将地址显示为[1]****
var f=''；
angular.forEach（callbackResult.results，函数（项）{
log（'address in angular:'+addresses）；//****将地址显示为[1]*****
if（item.types[0]=“locality”）{
对于（f=1；f

---

})

最终的解决方案是使用Angular的$q来回报承诺：

在控制器中：

.controller('LaunchformController', 
['$scope', '$q', 'geocoder', function ($scope, $q, geocoder) {

  $scope.getLocation = function(val) {      
    var deferred = $q.defer();      

    geocoder.geocode({ address: String(val), componentRestrictions: {'country':'US'} }, 
      function(callbackResult) {        
        deferred.resolve(callbackResult);
    });

    return deferred.promise;            
  };
}])

.service('geocoder',function() {
    this.geocode=function(georequest, outerCallback) {
      var geocoder = new google.maps.Geocoder();
      geocoder.geocode( georequest, function(results, status) {        
        if (status == google.maps.GeocoderStatus.OK) {          
          var f = '';                  
          var addresses = [];
          angular.forEach(results, function(item){  
            if (item.types[0] == 'locality') {          
              for (f=1;f<item.address_components.length;f++) {              
                if (item.address_components[f].types[0] == "administrative_area_level_1") {
                addresses.push(item.address_components[0].short_name + ', ' + item.address_components[f].short_name);            
                break;
                }
              }
            }            
          });
          outerCallback(addresses);         
        } else {
          outerCallback({success:false, err: new Error('Geocode was not successful for the following reason: ' + status), results: null});
        }
      });
    };
  })

在服务中：

.controller('LaunchformController', 
['$scope', '$q', 'geocoder', function ($scope, $q, geocoder) {

  $scope.getLocation = function(val) {      
    var deferred = $q.defer();      

    geocoder.geocode({ address: String(val), componentRestrictions: {'country':'US'} }, 
      function(callbackResult) {        
        deferred.resolve(callbackResult);
    });

    return deferred.promise;            
  };
}])

.service('geocoder',function() {
    this.geocode=function(georequest, outerCallback) {
      var geocoder = new google.maps.Geocoder();
      geocoder.geocode( georequest, function(results, status) {        
        if (status == google.maps.GeocoderStatus.OK) {          
          var f = '';                  
          var addresses = [];
          angular.forEach(results, function(item){  
            if (item.types[0] == 'locality') {          
              for (f=1;f<item.address_components.length;f++) {              
                if (item.address_components[f].types[0] == "administrative_area_level_1") {
                addresses.push(item.address_components[0].short_name + ', ' + item.address_components[f].short_name);            
                break;
                }
              }
            }            
          });
          outerCallback(addresses);         
        } else {
          outerCallback({success:false, err: new Error('Geocode was not successful for the following reason: ' + status), results: null});
        }
      });
    };
  })

.service（'geocoder'，function（）{
this.geocode=函数（georequest，outerCallback）{
var geocoder=new google.maps.geocoder（）；
地理编码（georequest，函数（结果，状态）{
如果（status==google.maps.GeocoderStatus.OK）{
var f=''；
var地址=[]；
forEach（结果，函数（项）{
if（item.types[0]=='locality'）{
对于（f=1；fy），您需要在回调函数中使用AJAX调用的结果来完成所有工作。有关详细信息，请参阅。关于这一点，有太多类似的问题，请查看，谢谢@Phil，我不知道Angular中的$q服务。这就成功了。