Javascript Navigator.geolocation

Question

我正在尝试 return position.coords.latitude 和经度作为变量在代码的其他地方使用。我如何获得 return 可用变量的函数？

if (navigator.geolocation) {
  navigator.geolocation.getCurrentPosition(function(position) {
     var lat = position.coords.latitude; 
     var lon = position.coords.longitude;
     var values = [lat, lon];

     return values;

  });
}   

console.log(values);

Answer 1

您应该使用回调方法。

读一读：

https://developer.mozilla.org/en-US/docs/Web/API/Geolocation/getCurrentPosition

var options = {
  enableHighAccuracy: true,
  timeout: 5000,
  maximumAge: 0
};

function success(pos) { // success callback
  var crd = pos.coords;

  console.log('Your current position is:');
  console.log('Latitude : ' + crd.latitude);
  console.log('Longitude: ' + crd.longitude);
  console.log('More or less ' + crd.accuracy + ' meters.');

  var values = [crd.latitude, crd.longitude];
  doSomethingWithCoordinateValues(values);
};

function doSomethingWithCoordinateValues(coords) {
  // do something with 'coords'
}

function error(err) { // error callback
  console.warn('ERROR(' + err.code + '): ' + err.message);
};

navigator.geolocation.getCurrentPosition(success, error, options);

您还可以阅读这篇 answer 的文章，其中指出：

If an inner function call is asynchronous, then all the functions 'wrapping' this call must also be asynchronous in order to 'return' a response.

Javascript Navigator.geolocation

Javascript Navigator.geolocation

javascript

variables

function

geolocation

navigator