小编nit*_*itz的帖子

我有env var SERVER_URL=localhost:8000

config.js

export const SERVER_URL = process.env.SERVER_URL;

export { SERVER_URL as default };

和行动:

function fetchData(apiUrl, timeout) {
    return timeoutPromise(timeout || 15000, fetch(`${SERVER_URL}${apiUrl}`))
        .then(checkHttpStatus)
        .then(parseJSON);
}

但是在使用之后fetchData我得到了http://localhost:8000/undefined/some_api

来自这里的idk undefined