React Native Environment Construction

Reference http://reactnative.cn/docs/0.39/getting-started.html

After the environment was built, I ran into a problem with the test run: "Unhandled JS exception:syntaxerror". Because after I installed the environment, I clicked run directly in Xcode, and then I ran on the command line without the problem (react-native Run-ios). The first time you run the command line, you can run it directly in Xcode.

How can I resolve this by pressing CMD+R in the iOS simulator?

To set up a computer keyboard connection:

Hardware-->keyboard-->connect Hardware Keyboard (shift+cmd+k)

React Native Environment Construction