RN 卡住在Running script 'Start Pack

https://github.com/react-community/create-react-native-app/issues/203

• 杀死所有node进程

killall node 或killall -9 node

• 清空watchman

watchman watch-del-all //可执行多次
//直到输出为
{
    "version": "4.9.0",
    "roots": []//为空
}

• 重置RN缓存

react-native start --reset-cache