ES6 承诺的未来价值

Question

我想要一个 future 值，它可以用值解决，以类似于 scala 的 future 的方式挂起或拒绝。

var username = new Promise();
username.then(x => console.log(x));

// half an hour later, triggered by user click or by ajax, or by timer, or  
username.resolve('john');

有内置的东西吗？还是我必须重新发明自行车？

Answer 1

Deferred.js 在 https://github.com/seangenabe/es6-deferred/blob/master/deferred.js

提供

"use strict";

var Promise = global.Promise || require('es6-promise').Promise;

var Deferred = function() {
  this.promise = new Promise((function(resolve, reject) {
    this.resolve = resolve;
    this.reject = reject;
  }).bind(this));

  this.then = this.promise.then.bind(this.promise);
  this.catch = this.promise.catch.bind(this.promise);
};

module.exports = Deferred;

用法示例：

var d = new Deferred();
d.then(x => console.log(x));
d.resolve('boo');

ES6 承诺的未来价值

future value with es6 promises

javascript

es6-promise