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EnixCoda
reviewed
Nov 18, 2017
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| ##[done] Observing (via .done) | ||
| ##[done] 观测 (通过 .done) |
| We now have a completed state machine, but we still have no way to observe any changes to it. | ||
| Our ultimate goal is to implement `.then`, but the semantics of `.done` are much | ||
| simpler so lets implement that first. | ||
| 现在，我们有了一个完整的内部状态机，但是我们还没有任何方法能够观测到它的变化。 |
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好像没提到 内部 ？
感觉可以精简一点： 但是我们还 没有任何方法能够 观测到它的变化。 > 但是我们还 无法 观测到它的变化。
| simpler so lets implement that first. | ||
| 现在，我们有了一个完整的内部状态机，但是我们还没有任何方法能够观测到它的变化。 | ||
| 我们的终极目标是实现 `.then` 方法，不过语义上来说， `.done` 方法看上去容易实现， | ||
| 我们就现在实现它吧。 |
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| :js | ||
| var PENDING = 0; |
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| ##[then] Observing (via .then) | ||
| ##[then] 观测 (通过 .then) |
| @@ -326,14 +315,14 @@ just do the same thing, but construct a new Promise in the process. | |||
| }); | |||
| } | |||
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| ##[apendix] Further Reading | |||
| ##[apendix] 更多阅读 | |||
| - [kriskowal/q](https://github.com/kriskowal/q/blob/v1/design/README.md) is a very different implementation of promises and comes with a very nice walkthrough of the design principals behind it. | ||
| - [petkaantonov/bluebird](https://github.com/petkaantonov/bluebird) is a promise implementation that was designed exclusively for performance (along with its own esoteric helper methods). The [Optimization Killers](https://github.com/petkaantonov/bluebird/wiki/Optimization-killers) Wiki page is extremely useful for picking up tips. | ||
| - [Stack Overflow](http://stackoverflow.com/questions/23772801/basic-javascript-promise-implementation-attempt/23785244#23785244) is the original source of this article. | ||
| - [then/promise](https://github.com/then/promise/blob/master/src/core.js) 简单的实现一个 promise 对象 |
| We now have the completed internal state machine, but we have yet to expose either | ||
| a method of resolving the promise or of observing it. Lets start by adding a way | ||
| of resolving the promise. | ||
| 现在，我们已经完成了内部的状态机，但是我们还没有执行处理函数，让我们开始处理 promise 。 |
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