如何使用谷歌地理編碼將地址轉換爲座標後的console.log數據？

Question

我正在開發一個應用程序，我需要從地理編碼文本地址派生的console.log地理座標。我用javascript編寫了以下代碼：

var geocoder = new google.maps.Geocoder(); 

    function address_to_coordinates(address_text) { 
    var address = address_text; 
    geocoder.geocode({ 'address': address}, function(results, status) { 
     if (status == google.maps.GeocoderStatus.OK) { 
     return results[0].geometry.location; 

     } else { 
     alert("Geocode was not successful for the following reason: " + status); 
     } 
    }); 
    } 

    console.log(address_to_coordinates('London')); 

由於某種原因，它在控制檯中輸出'undefined'。有沒有人看到它的原因？

Answer 1

你需要使用回調

var geocoder = new google.maps.Geocoder(); 

    function address_to_coordinates(address_text, callback) { 
    var address = address_text; 
    geocoder.geocode({ 'address': address}, function(results, status) { 
     if (status == google.maps.GeocoderStatus.OK) { 
     callback(results[0].geometry.location); 

     } else { 
     alert("Geocode was not successful for the following reason: " + status); 
     } 
    }); 
    } 

address_to_coordinates('London', function(location){ 
    console.log(location); 
});