JavaScript – Fetch, async, await

const start = async() => {
  //當回傳了資料 才執行 console.log
  let received_data = await getData();

  console.log("取得的資料:", received_data);
}

const getData = async() => {
  //等待伺服器回應
  let response = await fetch('url');
  //當伺服器回應了才取得資料
  let data = response.json();

  return data;
}

window.onload = () => {
  start();
}