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加入注意事项（已增添到英文版） #569

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Merged
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Jan 24, 2020
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加入注意事项（已增添到英文版） #569

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加入注意事项（已增添到英文版）
KennethKinLum Dec 27, 2019
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@bemself 建議修改
KennethKinLum Jan 24, 2020
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4 changes: 4 additions & 0 deletions 1-js/11-async/02-promise-basics/article.md
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Expand Up @@ -206,6 +206,10 @@ promise.then(alert); // 完成！（现在显示）
```

这对于有时需要时间而且有时要立即完成的任务来说非常方便。确保处理器在两种情况下都能够运行。

需要注意的是：这和真实生活中的”订阅列表“场景不同，并且更有效能：如果歌手已经发行了一首歌之后，人们才去注册订阅列表，这样很可能收不到那首歌。真实生活中，订阅必须发生在事件之前。

Promise 则更加灵活些。我们可以在任意时间添加处理器：如果结果已经在了，我们的处理器便会立即拿到这个结果。
````

````smart header="`.then/catch` 的处理器总是异步的"
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