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Merge pull request #643 from itellboy/patch-1

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Update promise.md
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@ -484,7 +484,7 @@ someAsyncThing().then(function() {
// carry on [ReferenceError: y is not defined]
```
上面代码中，第二个`catch`方法用来捕获，前一个`catch`方法抛出的错误。
上面代码中，第二个`catch`方法用来捕获前一个`catch`方法抛出的错误。
## Promise.prototype.finally()