我正在尝试使用匿名函数来获取两个数据集。使用两次fetch调用,第二次调用取决于第一次调用,第二次调用是循环,我在第二次调用中不断得到错误,response2.json不是函数
async function example() {
let response1 = await fetch(
`https://www.flickr.com/services/rest/?method=flickr.photos.search&api_key=9c348b767f7a0403e907b0788188afba&text=observatory&accuracy=+11&media=photos+&geo_context=1&lat=41.8989&lon=-87.6123&radius=25&radius_units=km&extras=&format=json&nojsoncallback=1`
);
let json = await response1.json();
console.log(json.photos.photo);
const response2 = await json.photos.photo.map((i) =>
fetch(
`https://www.flickr.com/services/rest/?method=flickr.photos.geo.getLocation&api_key=9c348b767f7a0403e907b0788188afba&photo_id=${i.id}&format=json&nojsoncallback=1`
)
);
const json2 = await response2.json();
console.log(json2);
return {
dataset1: json,
dataset2: json2
};
}
问题
response2
是应允数组,
[await json.photos.photo.map
不会使内部请求同步,
const response2 = await json.photos.photo.map((i) =>
fetch(
`https://www.flickr.com/services/rest/?method=flickr.photos.geo.getLocation&api_key=9c348b767f7a0403e907b0788188afba&photo_id=${i.id}&format=json&nojsoncallback=1`
)
);
解决方案:
let promises = json.photos.photo.map((i) =>
fetch(
`https://www.flickr.com/services/rest/?method=flickr.photos.geo.getLocation&api_key=9c348b767f7a0403e907b0788188afba&photo_id=${i.id}&format=json&nojsoncallback=1`
)
));
const response2 = await Promise.all(promises)