const datas = idList
  .map(id => url+'/id')
  .map(url => fetch(url).then(res => res.json()));
const p = new Promise.all(datas)
  .then(data => {...})


const datas = idList
  .map(id => url+'/id')
  .map(url => fetch(url).then(res => res.json()));
const foo = await Promise.all(datas);
const series = foo.map(data => {...})

 

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