Question

我想计算两个城市之间的距离，这里是代码：

function get_city_point(city) {
    var geocoder, point, result;
  geocoder = new google.maps.Geocoder;
    geocoder.geocode({address: city}, function(results, status) {
      if (status === google.maps.GeocoderStatus.OK) {
        result = results[0].geometry.location;
        point = result.lat() + "," + result.lng();
                console.log(point); // here's the coord.
      } else {
        alert("Geocode was not successful for the following reason: " + status);
      }
    });
    return point;
}

function count_the_distance(city1, city2) {
    var distance;
    var myp1 = new google.maps.LatLng(city1.split(',')[0], city1.split(',')[1]);
    var myp2 = new google.maps.LatLng(city2.split(',')[0], city2.split(',')[1]);

  return (google.maps.geometry.spherical.computeDistanceBetween(myp1, myp2)/1600).toFixed(2);
}
$(document).ready(function() {
    $('#calculate_it').click(function(){
        var city1 = get_city_point(document.getElementById("from").value);
        console.log(city1);
        var city2 = get_city_point(document.getElementById("to").value);
        console.log(city2);
        var distance = count_the_distance(city1, city2);
        console.log(distance);
    });
...

当我看一下控制台时，有这个输出：

undefined app.js?body=1:153
undefined app.js?body=1:155
Uncaught TypeError: Cannot read property 'split' of undefined app.js?body=1:119
43.653226,-79.38318429999998 main.js?body=1:109
40.0583238,-74.4056612

看起来第一个未定义是console.log(city1);的输出，console.log(city2);的第二个，Uncaught TypeError来自函数count_the_distance } - 因为参数传递了2 undefined s，最后两个协调来自get_city_point函数 - console.log(point)。

这是否意味着计算协调需要花费太多时间而不是返回lat + long而是返回undefined？因为函数console.log中的get_city_point表示协调已计算在内。

这里的问题在哪里？

谢谢你们。

Google Maps API无法计算两个城市之间的距离

0 个答案: