如何为只读属性分配值？

Question

我想要USER_KEY = user_id以下上下文，但我得到的是USER_KEY is read-only

错误

const userKey = (user_id) => {
  USER_KEY = user_id;
}

export const USER_KEY = '';
export const onSignIn = () => AsyncStorage.setItem(USER_KEY, 'true');
export const onSignOut = () => AsyncStorage.removeItem(USER_KEY);

Answer 1

您无法使用const声明重新分配值。您可以使用let制作变量。

const userKey = (user_id) => {
  USER_KEY = user_id;
}

export let USER_KEY = '';
export const onSignIn = () => AsyncStorage.setItem(USER_KEY, 'true');
export const onSignOut = () => AsyncStorage.removeItem(USER_KEY);