不允许等待promise是 为了鼓励开发非阻塞代码。 Waiting for a promise is disallowed to encourage the development of non-blocking code. Promises are something you make to other people.Promise是 JavaScriptES6中最令人兴奋的新增功能之一。Promises are one of the most exciting additions to JavaScript ES6.Promise was an accident.Promise是 一个对象,它代表了一个异步操作的最终完成或者失败。A Promise is an object representing the eventual completion or failure of an asynchronous operation.
例如,NodeJs是单线程的,如果promise是 CPU绑定的,那么并不会看到很多并行进程。 For example, Node Js is single threaded and if a promise is CPU bound you won't see much parallelism. 回调函数是指令式的,Promise是 函数式的:Node错失的最大机会. Callbacks are imperative, promises are functional: Node's biggest missed opportunity. Promise是 异步的,所以当我们到达第6行时,我们不知道Promise是否已经完成。The promise is asynchronous, so when we reach line 6, we can't know if the promise has completed or not. 既然我们知道promise是 如何创建的,我们就可以看看如何使用或处理promise。 Now that we know how promises are created we can look at how we can use or handle promises. . SandyHookPromise是 美国的一个非营利性公益组织,由SandyHook小学校园枪击案受害人的亲属们建立,致力于反校园暴力的宣传。 Sandy Hook Promise is a national non-profit started by families who lost loved ones in the horrendous school shooting at Sandy Hook Elementary. 具体来说,当区分使用时,future是变量的只读占位符视图,而promise是 可写的单赋值容器,用于设置future的值。 Specifically, when usage is distinguished, a future is a read-only placeholder view of a variable, while a promise is a writable, single assignment container which sets the value of the future. 我们先来看看jquery的Promise是 怎样实现的。 Let's first see how ajaxCallPromise would have been implemented. Why is the promise really a promise? Promise是 在ES6中引入的,并促使在编写JavaScript的异步代码方面,实现了巨大的提升。Promises were introduced in ES6, and made great improvements to writing asynchronous code in JavaScript. 默认情况下,type是"fx",这意味着当选定的元素已完成所有动画是返回的Promise是 解决的。 Type- By default, type is“fx”, which means that the returned Promise is resolved when all animations of the selected elements have completed. Future可以很容易地用channel实现:future是 一个单元素的channel,而promise 是一个发送到channel,实现future的过程。 Futures can easily be implemented in channels: a future is a one-element channel, and a promise is a process that sends to the channel, fulfilling the future. First of all, what is a promise ? First, what's the promise ? First, what is a Promise ? I promise this is the last post. 这确保了promise 回调是 异步的,即便promise已经变为settled状态。 This ensures promise callbacks are async even if the promise has already settled. Promise 愿景是 成为最受人信赖的检测认证品牌!!The Promise vision is to become the most trusted testing and certification brand!我们还没有谈到的一件事是Promise 实际上是什么。 One thing we haven't talked about yet is what a promise actually is. . But what of that last promise ? Promise 是一家微型企业家,他的业务是进口皮革制造鞋和箱包,他已经成为AMFB的客户11年了。Promise , who has a business importing leather for making shoes and bags, has been an Accion MfB client for 11 years. What is a Promise ? What makes promise ….
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