Node.js：意外的标记“.” 尝试在花括号中传递全局变量时

Question

I am using the package got to fetch pages from a website.

The website sets a new session cookie on every request so in order to stay logged in I need to use a cookie jar.

Here is the example for how to use a cookie jar from the got documentation:

const {promisify} = require('util');
const got = require('got');
const {CookieJar} = require('tough-cookie');

(async () => {
    const cookieJar = new CookieJar();
    const setCookie = promisify(cookieJar.setCookie.bind(cookieJar));

    await setCookie('foo=bar', 'https://example.com');
    await got('https://example.com', {cookieJar});
})();

In my case however, because the cookie gets reset after every request and requests can be made at any time from many different areas of my script I have defined my cookie jar as a global variable, like so: global.cookieJar = new CookieJar(); .

However, I find myself unable to pass the global variable to the got() function. Got's documentation only shows passing the cookie jar to the got() function by placing it in curly brackets. Therefore, I should be able to pass the variable like: await got('https://example.com', {global.cookieJar}) . But, if the variable in the curly brackets contains . () javascript throws an SyntaxError: Unexpected token '.' and does not allow the code to be executed.

How can I pass global.cookieJar to got() without causing a syntax error?

Answer 1

The syntax:

const foo = 1;
const object = { foo };

is shorthand for:

const foo = 1;
const object = { foo: foo };

There are two issues with:

{global.cookieJar}

• An identifier cannot have a . in it (hence your syntax error)
• The property name the function you are passing the object to is looking for is cookieJar , not global.cookieJar .

Don't use the shorthand.

{cookieJar: global.cookieJar}