我想分享一些不同的东西，这是这个话题的延伸。

有时，您希望“任务承诺”在解析时自动在相同的地址(属性或变量)重新创建。可以创建一个外部解析器来完成这个任务。

一个带有外部解析器的重复承诺的例子。无论何时调用解析器，都会在相同的地址/变量/属性处创建一个新的承诺。

let resolvePromise;
let thePromise;

const setPromise = (resolve) => {
  resolvePromise = () => {
    resolve();
    thePromise = new Promise(setPromise);   
  }
}
thePromise = new Promise(setPromise);

(async () => {
  let i = 0;
  while (true) {
    let msg = (i % 2 === 0) ? 'Tick' : 'Tock';
    document.body.innerHTML = msg;
    setTimeout(resolvePromise, 1000);
    await thePromise;
    i++;
  }
})();

https://jsfiddle.net/h3zvw5xr

公认的答案是错误的。使用范围和引用非常简单，尽管这可能会让Promise纯粹主义者生气:

const createPromise = () => {
    let resolver;
    return [
        new Promise((resolve, reject) => {
            resolver = resolve;
        }),
        resolver,
    ];
};

const [ promise, resolver ] = createPromise();
promise.then(value => console.log(value));
setTimeout(() => resolver('foo'), 1000);

我们实际上是在创建promise时获取resolve函数的引用，并返回该引用，以便可以在外部设置它。

在一秒钟内控制台将输出:

> foo

helper方法可以减轻这种额外的开销，并给您同样的jQuery感觉。

function Deferred() {
    let resolve;
    let reject;
    const promise = new Promise((res, rej) => {
        resolve = res;
        reject = rej;
    });
    return { promise, resolve, reject };
}

用法是

const { promise, resolve, reject } = Deferred();
displayConfirmationDialog({
    confirm: resolve,
    cancel: reject
});
return promise;

它类似于jQuery

const dfd = $.Deferred();
displayConfirmationDialog({
    confirm: dfd.resolve,
    cancel: dfd.reject
});
return dfd.promise();

不过，在用例中，这种简单的本机语法就可以了

return new Promise((resolve, reject) => {
    displayConfirmationDialog({
        confirm: resolve,
        cancel: reject
    });
});

简单:

var promiseResolve, promiseReject;

var promise = new Promise(function(resolve, reject){
  promiseResolve = resolve;
  promiseReject = reject;
});

promiseResolve();

这里的许多答案与本文最后一个示例类似。 我正在缓存多个promise, resolve()和reject()函数可以分配给任何变量或属性。因此，我能够使这段代码更加紧凑:

function defer(obj) {
    obj.promise = new Promise((resolve, reject) => {
        obj.resolve = resolve;
        obj.reject  = reject;
    });
}

下面是一个使用这个版本的defer()将一个FontFace加载承诺与另一个异步进程结合的简化示例:

function onDOMContentLoaded(evt) {
    let all = []; // array of Promises
    glob = {};    // global object used elsewhere
    defer(glob);
    all.push(glob.promise);
    // launch async process with callback = resolveGlob()

    const myFont = new FontFace("myFont", "url(myFont.woff2)");
    document.fonts.add(myFont);
    myFont.load();
    all.push[myFont];
    Promise.all(all).then(() => { runIt(); }, (v) => { alert(v); });
}
//...
function resolveGlob() {
    glob.resolve();
}
function runIt() {} // runs after all promises resolved 

更新:如果你想封装对象，有2个选择:

function defer(obj = {}) {
    obj.promise = new Promise((resolve, reject) => {
        obj.resolve = resolve;
        obj.reject  = reject;
    });
    return obj;
}
let deferred = defer();

and

class Deferred {
    constructor() {
        this.promise = new Promise((resolve, reject) => {
            this.resolve = resolve;
            this.reject  = reject;
        });
    }
}
let deferred = new Deferred();

我喜欢@JonJaques的回答，但我想更进一步。

如果你绑定并捕获Deferred对象，那么它完全实现了Promise API，你可以将它视为Promise并等待它等等。

⚠️ Editor's Note: I don't recommend this kind of pattern anymore since at the time of writing, Promise.prototype.finally was not a thing yet, then it became a thing… This could happen to other methods so I recommend you augment the promise instance with resolve and reject functions instead: function createDeferredPromise() { let resolve let reject const promise = new Promise((thisResolve, thisReject) => { resolve = thisResolve reject = thisReject }) return Object.assign(promise, {resolve, reject}) } Go upvote someone else's answer.

class DeferredPromise { constructor() { this._promise = new Promise((resolve, reject) => { // assign the resolve and reject functions to `this` // making them usable on the class instance this.resolve = resolve; this.reject = reject; }); // bind `then` and `catch` to implement the same interface as Promise this.then = this._promise.then.bind(this._promise); this.catch = this._promise.catch.bind(this._promise); this.finally = this._promise.finally.bind(this._promise); this[Symbol.toStringTag] = 'Promise'; } } const deferred = new DeferredPromise(); console.log('waiting 2 seconds...'); setTimeout(() => { deferred.resolve('whoa!'); }, 2000); async function someAsyncFunction() { const value = await deferred; console.log(value); } someAsyncFunction();