promise async await

promise async/await

nick12345 2022-03-28 21:26:56 ‧ 805 瀏覽

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請問這個寫法還有什麼問題嗎??

function getUser(userId: number): Promise<{ name: string }> {
  return Promise.resolve({ name: "User" });
}

function getMessage(): Promise<{ name: string }> {
  return Promise.resolve({ name: "hello" });
}

async function getGuest(): Promise<{ name: string }> { 
  let onResolve: ({ name: string }) => void = null;
  const answer = new Promise<{ name: string }>(resolve => onResolve = resolve);
  getUser(2).then(user => onResolve(user));
  return answer;
}

async function showGuestAndMessage(): void {
  task().then(user => console.log(user.name))
    .then(() => getMessage())
    .then(message => console.log(message.name));
}

㊣浩瀚星空㊣ iT邦大神 1 級 ‧ 2022-03-28 22:58:27 檢舉

不知道，或許你跑看看有沒有什麼問題。

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1 個回答

HAO

iT邦研究生 1 級 ‧ 2022-03-29 09:21:17

你好，那個 getGuest 跟 showGuestAndMessage 的寫法可以再簡化一點，可以用 async/await 來扁平化，然後我不知道 task 是不是打錯了，我猜應該是 getUser 或是 getGuest？

function getUser(userId: number) {
  return Promise.resolve({ name: "User" });
}

function getMessage() {
  return Promise.resolve({ name: "hello" });
}

function getGuest() { 
  return getUser(2);
}

async function showGuestAndMessage() {
  const guest = await getGuest();
  console.log(guest.name);
  const message = await getMessage();
  console.log(message.name);
}