[React Native 開發環境安裝和配置:-bash: react-native: command not found 報錯：
前提是安裝homebrew,node.js ,npm ,watchman,flow都成功。
執行react-native init TestProject 命令 創建demo時報錯：-bash: react-native: command not found
報錯提示：Please include the following file with any support request: /Users/ewu/npm-debug.log，就是npm-debug.log這個文件有權限，
解決方法：
加上sudo（root 權限）再執行命令：
sudo npm install -g react-native-cli
回車提示輸入電腦密碼，再回車，成功后再創建項目：
react-native init TestProject
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終端打印日志表示正在創建：
This will walk you through creating a new React Native project in /Users/maple/Downloads/hellow/Hellotestddd
Installing react-native package from npm...
Setting up new React Native app in /Users/...........