Fix minor typo error: ol number

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LeviDing 2020-07-18 12:16:23 +08:00 committed by GitHub
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@ -363,7 +363,7 @@ The "rethrowing" technique can be explained in more detail as:
1. Catch gets all errors.
2. In the `catch(err) {...}` block we analyze the error object `err`.
2. If we don't know how to handle it, we do `throw err`.
3. If we don't know how to handle it, we do `throw err`.
Usually, we can check the error type using the `instanceof` operator: