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fetch 直接访问gooogle map 求路径,失败

fetch 直接访问gooogle map 求路径,失败,但是我把url 直接贴在浏览器却可以返回数据的?
代码如下:

var BASE_URL = 'https://maps.googleapis.com/maps/api/directions/json?';
 var src =  {
    latitude: 39.99709957757345,
    longitude: 116.31184045225382,
  };
  var dest = {
    latitude: 39.949158391497214,
    longitude: 116.4154639095068
  };
  var url = BASE_URL + 'origin=' + src.latitude + ',' + src.longitude
    + '&destination=' + dest.latitude + ',' + dest.longitude + '&sensor=false&mode=driving'
   fetchData(url, doData);
  console.log(url);

返回失败信息如下:
https://maps.googleapis.com/m...
{ error_message: 'Invalid request. Missing the 'origin' parameter.',
routes: [],
status: 'INVALID_REQUEST' }
如果直接把拼成的url放到浏览器却可以返回数据的,返回略。


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