Here's what that looks like in practice: Let's compare promises to callbacks. You're likely to have met with callbacks before, JavaScript is full of them. let theFuture = function (callback) { setTimeout(callback, 5000) } theFuture(() => { console.log("It is now 5 seconds...
配置如下： INSTALLED_APPS = [ 'simpleui' 'django.contrib.admin', 'django.contrib...
class Promise { constructor(executor) { this.state = 'pending'; this.value = undefined; this.reason = undefined; this.callbacks = []; const resolve = (value) => { if (this.state === 'pending') { this.state = 'fulfilled'; this.value = value; this.callbacks.forEach((callback) =>...
配置如下： INSTALLED_APPS = [ 'simpleui' 'django.contrib.admin', 'django.contrib...