React Native?使用Yarn，?Yarn是Facebook提供的替代npm的工具，可以加速node模塊的下載

1. 安裝Yarn:?

npm install -g yarn react-native-cli

2. 設(shè)置國(guó)內(nèi)鏡像：

npm config set registry https://registry.npm.taobao.org --global

npm config set disturl https://npm.taobao.org/dist --global

3.?命令,?參考：https://blog.csdn.net/u013233097/article/details/78652728

react-native init projectname

npm install --> yarn

npm install --save react-navigation --> yarn add react-navigation