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fix a broken link and provide a trick to diable log 

Summary:
P.S, now we have four docs about navigator(s). But from my POV, the content are more or less repeated, and the logic is a little messy. I suggest someone to reforge these docs, in a more vivid and evolutionary way. Thank you!
Closes https://github.com/facebook/react-native/pull/9975

Differential Revision: D3907167

Pulled By: JoelMarcey

fbshipit-source-id: 9db05f8a3d70f28c6104e7cc6a2813e7eaa9f6fa
This commit is contained in:
sunnylqm 2016-09-22 07:39:43 -07:00 committed by Facebook Github Bot 2
parent df5d14c568
commit 5f8c82412f
1 changed files with 14 additions and 1 deletions
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15
docs/Performance.md
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@ -73,7 +73,7 @@ out of the box than `Navigator`. The reason for this is that the
animations for the transitions are done entirely on the main thread, and
so they are not interrupted by frame drops on the JavaScript thread.
([Read about why you should probably use Navigator
anyways.](docs/navigator-comparison.html))
anyways.](docs/using-navigators.html)
Similarly, you can happily scroll up and down through a ScrollView when
the JavaScript thread is locked up because the ScrollView lives on the
@ -86,6 +86,19 @@ but their receipt is not necessary for the scroll to occur).
When running a bundled app, these statements can cause a big bottleneck in the JavaScript thread. This includes calls from debugging libraries such as [redux-logger](https://github.com/evgenyrodionov/redux-logger), so make sure to remove them before bundling.
> There is a [babel plugin](https://babeljs.io/docs/plugins/transform-remove-console/) that can remove all `console.*` calls. You need to install it first using `npm install babel-plugin-transform-remove-console --save`, and then edit (or create) `.babelrc` under your project directory like the following:
```json
{
"env": {
"production": {
"plugins": ["transform-remove-console"]
}
}
}
```
Then it will automatically remove all `console.*` calls in a release (production) version of your project. However, the `console.*` calls will still be executed in the debug version of your project.
#### Development mode (dev=true)
JavaScript thread performance suffers greatly when running in dev mode.