Questions

1.

解决办法：NODE服务没启动试试react-native start

2.undefined is not an object (evaluating ‘RNGestureHandlerModule.State’ React Navigation

升级到3.x版本后，遇到了undefined is not an object (evaluating 'RNGestureHandlerModule.State'。 解决办法：

步骤如下：

npm install

npm install --save react-navigation

npm install --save react-native-gesture-handler

react-native link