🍄Promise

JS ⟩ async ⟩ Promise

⭐️ ES6 (2015) the future result of an async operation.

let p = promise.then(onFulfilled, onRejected)

🔸 定義

if we have：

let p = promise.then(onResolved, onRejected)

we say p is：

• resolved if onResolved() is called.

  • fulfilled if onResolved() returns a non-Promise value.

• rejected if onRejected() is called.

• settled if it's fulfilled or rejected.

• pending if it's neither fulfilled nor rejected.

Any settled Promise has an associated value , which won't change.

🔴 主題

👥 相關

📗 參考

📘 手冊