javascript 中的 resolve, reject 关键字是什么？

Question

const promise = new Promise((resolve, reject) => {
  if(allWentWell) {
    resolve('All things went well!');
  } else {
    reject('Something went wrong');
  }
});

Can I change resolve to res ? Or does resolve have special meaning here?

Answer 1

No they aren't keywords you can name them whatever you want, but IMO you should keep the names as descriptive as possible.

 const promise = new Promise((res, rej) => { if(true) { res('All things went well;'); } else { rej('Something went wrong'); } }). promise.then(val=> console.log(val))

Answer 2

No. The Promise constructor expects a function and will pass two arguments to it: the first one being a function that resolves the promise, and the second one being a function that rejects the promise. With that being said, you can name these arguments anything you want, but they must be in the correct order.

const myFunction = function (x, y) {
  if (allWentWell) {
    x('All things went well!')
  } else {
    y('Something went wrong')
  }
}

new Promise(myFunction)

I'd say it's a good practice though to keep them named resolve and reject , as most examples on the web use it so programmers end up expecting for it.