如何处理CoffeeScript的异步调用？ [英] How does CoffeeScript handle Asynchronous Calls?

问题描述

目前异步JavaScript调用需要我们使用一个回调函数。当您需要根据在第一次Ajax调用返回的数据第2个Ajax调用这可能会导致兔子洞code。

Current Asynchronous JavaScript calls require us to use a Callback function. This can lead to "rabbit hole" code when you need to make a 2nd Ajax call based on data returned in a 1st Ajax call.

有过尝试，使无需使用回调异步JavaScript调用。谷歌，Narative.js。我们的目标是更易于管理和易读code。

There have been attempts to make Asynchronous JavaScript calls without the use of Callbacks. Google, Narative.js. The goal being more manageable and readable code.

我的问题是，如何处理CoffeeScript的异步JavaScript调用Ajax的一样？正在回调需要或异步调用在不回调做？

My question is, How does CoffeeScript handle Asynchronous JavaScript calls like Ajax? Are callbacks required or can Asynchronous calls be made without callbacks?

推荐答案

CoffeeScript中并没有提供对异步性面向任何特定的功能，因为这会造成一定CoffeeScript的code和JavaScript输出之间有很大的差距。请参阅有关的讨论所提出的延迟语法：

CoffeeScript doesn't offer any particular features geared toward asynchronicity, because this would necessarily cause a large gap between CoffeeScript code and the JavaScript output. See the discussion about the proposed defer syntax:

https://github.com/jashkenas/coffee-script/issues/350

所以，如果你使用的CoffeeScript，你应该处理使用相同的成语和库在JavaScript中异步行为。所不同的是你的回调将写为 - ＆GT; ... ，而不是函数（）{...} 。

So, if you use CoffeeScript, you should deal with asynchronous behavior using the same idioms and libraries as in JavaScript. The difference is that your callbacks will be written as -> ... rather than function() {...}.

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